| Place Name | County | Total ZIP Codes | Population (2022) |
|---|
| Ackley | Hardin County | 1 | 1,469 |
| Ackworth | Warren County | 1 | 54 |
| Adair | Adair County | 1 | 844 |
| Adams Township (Dallas County) | Dallas County | 3 | 1,538 |
| Adams Township (Delaware County) | Delaware County | 3 | 786 |
| Adams Township (Keokuk County) | Keokuk County | 3 | 445 |
|
| Adams Township (Mahaska County) | Mahaska County | 3 | 99 |
| Adams Township (Wapello County) | Wapello County | 2 | 549 |
| Adel | Dallas County | 1 | 3,767 |
| Adel Township | Dallas County | 2 | 8,216 |
| Afton | Union County | 1 | 844 |
|
| Afton Township (Cherokee County) | Cherokee County | 2 | 107 |
| Afton Township (Howard County) | Howard County | 3 | 788 |
| Agency | Wapello County | 1 | 706 |
| Agency Township | Wapello County | 2 | 1,089 |
| Ainsworth | Washington County | 1 | 496 |
| Akron | Plymouth County | 1 | 1,484 |
| Albert City | Buena Vista County | 1 | 654 |
| Albia | Monroe County | 1 | 3,772 |
| Albion | Marshall County | 1 | 444 |
| Albion Township (Butler County) | Butler County | 2 | 1,982 |
|
| Albion Township (Howard County) | Howard County | 2 | 323 |
| Alburnett | Linn County | 1 | 702 |
| Alden | Hardin County | 1 | 873 |
| Alden Township | Hardin County | 2 | 1,191 |
| Alexander | Franklin County | 1 | 165 |
| Algona | Kossuth County | 1 | 5,534 |
| Alleman | Polk County | 1 | 621 |
| Allen Township (Harrison County) | Harrison County | 4 | 168 |
| Allen Township (Polk County) | Polk County | 4 | 4,270 |
| Allen Township (Warren County) | Warren County | 3 | 4,686 |
|
| Allens Grove Township | Scott County | 3 | 887 |
| Allerton | Wayne County | 1 | 560 |
| Allison | Butler County | 1 | 995 |
| Allison Township (Lyon County) | Lyon County | 2 | 254 |
| Allison Township (Osceola County) | Osceola County | 2 | 158 |
| Alta | Buena Vista County | 1 | 1,835 |
| Alta Vista | Chickasaw County | 1 | 290 |
| Alton | Sioux County | 1 | 1,073 |
| Altoona | Polk County | 1 | 14,563 |
| Alvord | Lyon County | 1 | 183 |
| Amana | Iowa County | 1 | 382 |
| Amaqua Township | Boone County | 4 | 389 |
| America Township | Plymouth County | 1 | 10,749 |
| Ames | Story County | 5 | 59,206 |
| Amherst Township | Cherokee County | 2 | 777 |
| Amity Township | Page County | 5 | 499 |
| Amsterdam Township | Hancock County | 1 | 971 |
| Anamosa | Jones County | 1 | 5,605 |
| Anderson | Fremont County | 1 | 47 |
| Anderson Township | Mills County | 5 | 413 |
|
| Andover | Clinton County | 1 | 120 |
| Andrew | Jackson County | 1 | 430 |
| Anita | Cass County | 1 | 1,014 |
| Ankeny | Polk County | 2 | 45,732 |
| Anthon | Woodbury County | 1 | 704 |
| Aplington | Butler County | 1 | 1,057 |
| Arcadia | Carroll County | 1 | 567 |
| Arcadia Township | Carroll County | 3 | 1,185 |
| Archer | Obrien County | 1 | 130 |
| Aredale | Butler County | 1 | 72 |
| Argo | Scott County | 3 | 0 |
| Argyle | Lee County | 1 | 37 |
| Arion | Crawford County | 1 | 122 |
| Arispe | Union County | 2 | 74 |
| Arlington | Fayette County | 1 | 526 |
| Arlington Township | Woodbury County | 2 | 2,190 |
| Armstrong | Emmet County | 1 | 904 |
| Armstrong Grove Township | Emmet County | 3 | 909 |
| Arnolds Park | Dickinson County | 1 | 1,007 |
| Arthur | Ida County | 1 | 197 |
| Asbury | Dubuque County | 1 | 4,385 |
| Ashton | Osceola County | 1 | 390 |
| Ashton Township | Monona County | 2 | 597 |
| Aspinwall | Crawford County | 1 | 23 |
| Atalissa | Muscatine County | 1 | 470 |
| Athelstan | Taylor County | 1 | 27 |
| Athens Township | Ringgold County | 1 | 389 |
| Atkins | Benton County | 1 | 1,878 |
| Atlantic | Cass County | 1 | 7,040 |
| Auburn | Sac County | 1 | 227 |
| Auburn Township | Fayette County | 4 | 598 |
| Audubon | Audubon County | 1 | 2,246 |
| Audubon Township | Audubon County | 3 | 290 |
| Augusta | Des Moines County | 3 | 47 |
| Aurelia | Cherokee County | 1 | 1,122 |
| Aurora | Buchanan County | 1 | 235 |
| Austinville | Butler County | 1 | |
| Avery Township (Hancock County) | Hancock County | 3 | 302 |
| Avery Township (Humboldt County) | Humboldt County | 3 | 262 |
| Avoca | Pottawattamie County | 1 | 1,387 |
| Ayrshire | Palo Alto County | 1 | 142 |
| Badger | Webster County | 1 | 471 |
| Badger Township | Webster County | 4 | 1,075 |
| Bagley | Guthrie County | 1 | 339 |
| Baker Township (Guthrie County) | Guthrie County | 2 | 280 |
| Baker Township (Obrien County) | Obrien County | 3 | 190 |
| Baker Township (Osceola County) | Osceola County | 3 | 419 |
| Baldwin | Jackson County | 1 | 108 |
| Balltown | Dubuque County | 1 | 49 |
| Baltimore Township | Henry County | 3 | 802 |
| Bancroft | Kossuth County | 1 | 747 |
| Bangor Township | Marshall County | 4 | 628 |
| Banks Township | Fayette County | 2 | 234 |
| Bankston | Dubuque County | 2 | 11 |
| Banner Township | Woodbury County | 3 | 1,252 |
| Barclay Township | Black Hawk County | 3 | 504 |
| Barnes City | Mahaska County | 1 | 252 |
| Barnes Township | Buena Vista County | 3 | 426 |
| Barnum | Webster County | 1 | 184 |
| Bartlett | Fremont County | 1 | 10 |
| Barton Township | Worth County | 4 | 58 |
| Bassett | Chickasaw County | 1 | 79 |
| Batavia | Jefferson County | 1 | 431 |
| Bath Township | Cerro Gordo County | 2 | 200 |
| Battle Creek | Ida County | 1 | 720 |
| Battle Township | Ida County | 4 | 241 |
| Baxter | Jasper County | 1 | 1,140 |
| Bayard | Guthrie County | 1 | 495 |
| Beacon | Mahaska County | 1 | 433 |
| Beaconsfield | Ringgold County | 1 | 16 |
| Beaman | Grundy County | 1 | 203 |
| Bear Creek Township | Poweshiek County | 2 | 2,030 |
| Bear Grove Township (Cass County) | Cass County | 4 | 280 |
| Bear Grove Township (Guthrie County) | Guthrie County | 2 | 234 |
| Beaver | Boone County | 1 | 25 |
| Beaver Township (Boone County) | Boone County | 3 | 80 |
| Beaver Township (Butler County) | Butler County | 3 | 1,223 |
| Beaver Township (Dallas County) | Dallas County | 4 | 682 |
| Beaver Township (Grundy County) | Grundy County | 5 | 536 |
| Beaver Township (Guthrie County) | Guthrie County | 4 | 540 |
| Beaver Township (Humboldt County) | Humboldt County | 4 | 305 |
| Beaver Township (Polk County) | Polk County | 3 | 3,033 |
| Beaverdale | Des Moines County | 2 | 984 |
| Bedford | Taylor County | 1 | 1,588 |
| Bedford Township | Taylor County | 1 | 1,373 |
| Belknap Township | Pottawattamie County | 1 | 1,807 |
| Bellair Township | Appanoose County | 2 | 432 |
| Belle Plaine | Benton County | 1 | 2,560 |
| Bellevue | Jackson County | 1 | 2,246 |
| Bellevue Township | Jackson County | 1 | 2,758 |
| Bellville Township | Pocahontas County | 3 | 299 |
| Belmond | Wright County | 1 | 2,210 |
| Belmond Township | Wright County | 3 | 344 |
| Belmont Township | Warren County | 3 | 1,244 |
| Belvidere Township | Monona County | 5 | 263 |
| Bennett | Cedar County | 1 | 489 |
| Bennezette Township | Butler County | 5 | 227 |
| Bennington Township | Black Hawk County | 3 | 329 |
| Bentley | Pottawattamie County | 2 | 92 |
| Benton | Ringgold County | 1 | 44 |
| Benton Township (Benton County) | Benton County | 3 | 1,135 |
| Benton Township (Cass County) | Cass County | 3 | 149 |
| Benton Township (Des Moines County) | Des Moines County | 3 | 688 |
| Benton Township (Fremont County) | Fremont County | 2 | 252 |
| Benton Township (Keokuk County) | Keokuk County | 3 | 1,025 |
| Benton Township (Lucas County) | Lucas County | 2 | 388 |
| Benton Township (Ringgold County) | Ringgold County | 2 | 105 |
| Benton Township (Taylor County) | Taylor County | 2 | 200 |
| Benton Township (Wayne County) | Wayne County | 1 | 171 |
| Berkley | Boone County | 2 | 20 |
| Bernard | Dubuque County | 1 | 124 |
| Bertram | Linn County | 1 | 338 |
| Bertram Township | Linn County | 4 | 2,744 |
| Berwick | Polk County | 1 | |
| Bethel Township | Fayette County | 3 | 250 |
| Bettendorf | Scott County | 1 | 33,347 |
| Bevington | Madison County | 1 | 29 |
| Big Creek Township | Black Hawk County | 1 | 2,605 |
| Big Grove Township (Benton County) | Benton County | 4 | 159 |
| Big Grove Township (Johnson County) | Johnson County | 3 | 4,901 |
| Big Rock | Scott County | 4 | 34 |
| Bingham Township | Hancock County | 2 | 311 |
| Birmingham | Van Buren County | 1 | 440 |
| Black Hawk Township (Black Hawk County) | Black Hawk County | 3 | 2,940 |
| Black Hawk Township (Grundy County) | Grundy County | 1 | 1,874 |
| Black Hawk Township (Jefferson County) | Jefferson County | 3 | 307 |
| Black Oak Township | Mahaska County | 3 | 603 |
| Blaine Township (Ida County) | Ida County | 2 | 428 |
| Blaine Township (Wright County) | Wright County | 4 | 687 |
| Blairsburg | Hamilton County | 1 | 157 |
| Blairsburg Township | Hamilton County | 2 | 265 |
| Blairstown | Benton County | 1 | 691 |
| Blakesburg | Wapello County | 1 | 259 |
| Blanchard | Page County | 1 | 43 |
| Blencoe | Monona County | 1 | 217 |
| Blockton | Taylor County | 1 | 155 |
| Bloomfield | Davis County | 1 | 2,619 |
| Bloomfield Township (Clinton County) | Clinton County | 2 | 680 |
| Bloomfield Township (Polk County) | Polk County | 5 | 32,990 |
| Bloomfield Township (Winneshiek County) | Winneshiek County | 3 | 665 |
| Bloomington Township (Decatur County) | Decatur County | 1 | 442 |
| Bloomington Township (Muscatine County) | Muscatine County | 1 | 24,947 |
| Blue Grass | Scott County | 1 | 1,426 |
| Blue Grass Township | Scott County | 4 | 3,914 |
| Bluff Creek Township | Monroe County | 4 | 265 |
| Bluffton Township | Winneshiek County | 3 | 257 |
| Boardman Township | Clayton County | 2 | 1,522 |
| Bode | Humboldt County | 1 | 352 |
| Bolan | Worth County | 1 | 26 |
| Bonaparte | Van Buren County | 1 | 402 |
| Bonaparte Township | Van Buren County | 2 | 736 |
| Bondurant | Polk County | 1 | 3,891 |
| Boomer Township | Pottawattamie County | 4 | 526 |
| Boone | Boone County | 1 | 12,658 |
| Boone Township (Dallas County) | Dallas County | 6 | 30,424 |
| Boone Township (Hancock County) | Hancock County | 4 | 70 |
| Boone Township (Wright County) | Wright County | 3 | 114 |
| Booneville | Dallas County | 1 | |
| Booth Township | Palo Alto County | 3 | 56 |
| Boulder Township | Linn County | 5 | 429 |
| Bouton | Dallas County | 1 | 101 |
| Boxholm | Boone County | 1 | 279 |
| Boyden | Sioux County | 1 | 679 |
| Boyer Township (Crawford County) | Crawford County | 2 | 225 |
| Boyer Township (Harrison County) | Harrison County | 2 | 1,781 |
| Boyer Valley Township | Sac County | 3 | 1,063 |
| Braddyville | Page County | 1 | 105 |
| Bradford | Franklin County | 1 | 75 |
| Bradford Township | Chickasaw County | 2 | 1,971 |
| Bradgate | Humboldt County | 1 | 59 |
| Brandon | Buchanan County | 1 | 353 |
| Brandon Township | Jackson County | 4 | 138 |
| Brayton | Audubon County | 1 | 151 |
| Breda | Carroll County | 1 | 451 |
| Bremen Township | Delaware County | 3 | 1,007 |
| Bridgewater | Adair County | 1 | 131 |
| Brighton | Washington County | 1 | 600 |
| Brighton Township (Cass County) | Cass County | 3 | 266 |
| Brighton Township (Washington County) | Washington County | 2 | 711 |
| Bristol Township (Greene County) | Greene County | 3 | 301 |
| Bristol Township (Worth County) | Worth County | 3 | 455 |
| Bristow | Butler County | 1 | 159 |
| Britt | Hancock County | 1 | 2,218 |
| Britt Township | Hancock County | 1 | 2,131 |
| Bronson | Woodbury County | 1 | 357 |
| Brooke Township | Buena Vista County | 3 | 142 |
| Brookfield Township (Clinton County) | Clinton County | 3 | 234 |
| Brookfield Township (Worth County) | Worth County | 4 | 162 |
| Brooklyn | Poweshiek County | 1 | 1,341 |
| Brown Township | Linn County | 3 | 2,201 |
| Bruce Township | Benton County | 2 | 259 |
| Brunsville | Plymouth County | 1 | 94 |
| Bryant | Clinton County | 1 | |
| Buchanan Township (Jefferson County) | Jefferson County | 2 | 490 |
| Buchanan Township (Page County) | Page County | 3 | 277 |
| Buck Grove | Crawford County | 1 | 35 |
| Buckeye | Hardin County | 1 | 80 |
| Buckeye Township | Hardin County | 3 | 265 |
| Buckingham | Tama County | 1 | |
| Buckingham Township | Tama County | 3 | 156 |
| Buena Vista Township (Clayton County) | Clayton County | 5 | 287 |
| Buena Vista Township (Jasper County) | Jasper County | 4 | 427 |
| Buffalo | Scott County | 1 | 1,196 |
| Buffalo Center | Winnebago County | 1 | 1,007 |
| Buffalo Township (Buchanan County) | Buchanan County | 5 | 410 |
| Buffalo Township (Kossuth County) | Kossuth County | 3 | 747 |
| Buffalo Township (Linn County) | Linn County | 4 | 687 |
| Buffalo Township (Scott County) | Scott County | 4 | 5,075 |
| Buffalo Township (Winnebago County) | Winnebago County | 1 | 1,222 |
| Buncombe Township | Sioux County | 2 | 2,270 |
| Burchinal | Cerro Gordo County | 1 | 16 |
| Burlington | Des Moines County | 1 | 25,624 |
| Burnside | Webster County | 1 | |
| Burnside Township | Webster County | 6 | 166 |
| Burr Oak | Winneshiek County | 1 | 190 |
| Burr Oak Township (Mitchell County) | Mitchell County | 3 | 86 |
| Burr Oak Township (Winneshiek County) | Winneshiek County | 3 | 560 |
| Burrell Township | Decatur County | 3 | 264 |
| Burt | Kossuth County | 1 | 404 |
| Burt Township | Kossuth County | 3 | 918 |
| Bussey | Marion County | 1 | 415 |
| Butler Township (Butler County) | Butler County | 4 | 1,692 |
| Butler Township (Calhoun County) | Calhoun County | 3 | 710 |
| Butler Township (Jackson County) | Jackson County | 1 | 310 |
| Butler Township (Scott County) | Scott County | 4 | 3,483 |
| Byron Township | Buchanan County | 3 | 1,199 |
| Calamus | Clinton County | 1 | 389 |
| Caldwell Township | Appanoose County | 4 | 268 |
| Caledonia Township | Obrien County | 3 | 345 |
| Calhoun Township (Calhoun County) | Calhoun County | 2 | 125 |
| Calhoun Township (Harrison County) | Harrison County | 3 | 116 |
| California Junction | Harrison County | 1 | 132 |
| Callender | Webster County | 1 | 389 |
| Calmar | Winneshiek County | 1 | 1,075 |
| Calmar Township | Winneshiek County | 4 | 1,918 |
| Calumet | Obrien County | 1 | 309 |
| Camanche | Clinton County | 1 | 4,429 |
| Camanche Township | Clinton County | 4 | 5,030 |
| Cambridge | Story County | 1 | 825 |
| Cameron Township | Audubon County | 1 | 210 |
| Camp Township | Polk County | 7 | 2,420 |
| Canaan Township | Henry County | 2 | 334 |
| Canoe Township | Winneshiek County | 1 | 523 |
| Canton Township | Benton County | 3 | 726 |
| Cantril | Van Buren County | 1 | 172 |
| Capel Township | Sioux County | 6 | 349 |
| Carbon | Adams County | 1 | 24 |
| Carl Township | Adams County | 3 | 187 |
| Carlisle | Warren County | 1 | 4,070 |
| Carlton Township | Tama County | 3 | 1,083 |
| Carpenter | Mitchell County | 1 | 82 |
| Carroll | Carroll County | 1 | 10,057 |
| Carroll Township (Obrien County) | Obrien County | 3 | 641 |
| Carroll Township (Tama County) | Tama County | 2 | 76 |
| Carson | Pottawattamie County | 1 | 776 |
| Carson Township | Pottawattamie County | 3 | 918 |
| Carter Lake | Pottawattamie County | 1 | 3,743 |
| Cascade | Dubuque County | 1 | 1,996 |
| Cascade Township | Dubuque County | 5 | 1,203 |
| Casey | Guthrie County | 1 | 457 |
| Cass Township (Boone County) | Boone County | 2 | 487 |
| Cass Township (Cass County) | Cass County | 3 | 666 |
| Cass Township (Cedar County) | Cedar County | 5 | 501 |
| Cass Township (Clayton County) | Clayton County | 2 | 1,841 |
| Cass Township (Guthrie County) | Guthrie County | 5 | 2,590 |
| Cass Township (Hamilton County) | Hamilton County | 2 | 341 |
| Cass Township (Harrison County) | Harrison County | 4 | 242 |
| Cass Township (Jones County) | Jones County | 3 | 572 |
| Cass Township (Shelby County) | Shelby County | 2 | 391 |
| Cass Township (Wapello County) | Wapello County | 3 | 215 |
| Castalia | Winneshiek County | 1 | 162 |
| Castana | Monona County | 1 | 140 |
| Castle Grove Township | Jones County | 4 | 500 |
| Cedar Falls | Black Hawk County | 2 | 39,197 |
| Cedar Falls Township | Black Hawk County | 1 | 399 |
| Cedar Rapids | Linn County | 6 | 126,921 |
| Cedar Township (Benton County) | Benton County | 3 | 398 |
| Cedar Township (Black Hawk County) | Black Hawk County | 5 | 1,428 |
| Cedar Township (Calhoun County) | Calhoun County | 4 | 225 |
| Cedar Township (Cherokee County) | Cherokee County | 4 | 354 |
| Cedar Township (Floyd County) | Floyd County | 3 | 558 |
| Cedar Township (Greene County) | Greene County | 2 | 85 |
| Cedar Township (Jefferson County) | Jefferson County | 3 | 452 |
| Cedar Township (Johnson County) | Johnson County | 4 | 459 |
| Cedar Township (Lee County) | Lee County | 4 | 385 |
| Cedar Township (Lucas County) | Lucas County | 3 | 327 |
| Cedar Township (Mahaska County) | Mahaska County | 3 | 1,101 |
| Cedar Township (Mitchell County) | Mitchell County | 5 | 803 |
| Cedar Township (Monroe County) | Monroe County | 2 | 93 |
| Cedar Township (Muscatine County) | Muscatine County | 2 | 371 |
| Cedar Township (Pocahontas County) | Pocahontas County | 1 | 790 |
| Cedar Township (Sac County) | Sac County | 2 | 339 |
| Cedar Township (Van Buren County) | Van Buren County | 3 | 205 |
| Cedar Township (Washington County) | Washington County | 3 | 233 |
| Centennial Township | Lyon County | 3 | 315 |
| Center Grove Township | Dickinson County | 4 | 8,590 |
| Center Junction | Jones County | 1 | 133 |
| Center Point | Linn County | 1 | 2,494 |
| Center Township (Allamakee County) | Allamakee County | 4 | 233 |
| Center Township (Calhoun County) | Calhoun County | 2 | 1,285 |
| Center Township (Cedar County) | Cedar County | 1 | 4,211 |
| Center Township (Clinton County) | Clinton County | 4 | 604 |
| Center Township (Decatur County) | Decatur County | 1 | 311 |
| Center Township (Dubuque County) | Dubuque County | 4 | 2,773 |
| Center Township (Emmet County) | Emmet County | 1 | 247 |
| Center Township (Fayette County) | Fayette County | 6 | 343 |
| Center Township (Henry County) | Henry County | 1 | 938 |
| Center Township (Jefferson County) | Jefferson County | 3 | 1,054 |
| Center Township (Mills County) | Mills County | 2 | 674 |
| Center Township (Monona County) | Monona County | 3 | 156 |
| Center Township (Obrien County) | Obrien County | 3 | 435 |
| Center Township (Pocahontas County) | Pocahontas County | 1 | 1,583 |
| Center Township (Pottawattamie County) | Pottawattamie County | 3 | 283 |
| Center Township (Shelby County) | Shelby County | 1 | 490 |
| Center Township (Sioux County) | Sioux County | 4 | 716 |
| Center Township (Wapello County) | Wapello County | 2 | 26,933 |
| Center Township (Winnebago County) | Winnebago County | 3 | 2,425 |
| Centerville | Appanoose County | 1 | 5,519 |
| Central City | Linn County | 1 | 1,264 |
| Centralia | Dubuque County | 1 | 151 |
| Chapin | Franklin County | 1 | 163 |
| Chariton | Lucas County | 1 | 4,333 |
| Chariton Township | Appanoose County | 2 | 252 |
| Charles City | Floyd County | 1 | 7,600 |
| Charleston Township | Lee County | 3 | 807 |
| Charlotte | Clinton County | 1 | 407 |
| Charter Oak | Crawford County | 1 | 418 |
| Charter Oak Township | Crawford County | 2 | 705 |
| Chatsworth | Sioux County | 1 | 44 |
| Chelsea | Tama County | 1 | 268 |
| Chequest Township | Van Buren County | 3 | 319 |
| Cherokee | Cherokee County | 1 | 5,196 |
| Cherokee Township | Cherokee County | 2 | 6,023 |
| Chester | Howard County | 1 | 202 |
| Chester Township (Howard County) | Howard County | 2 | 360 |
| Chester Township (Poweshiek County) | Poweshiek County | 2 | 335 |
| Chickasaw Township | Chickasaw County | 3 | 814 |
| Chillicothe | Wapello County | 1 | 91 |
| Churdan | Greene County | 1 | 356 |
| Cincinnati | Appanoose County | 1 | 286 |
| Cincinnati Township | Harrison County | 4 | 138 |
| Clare | Webster County | 1 | 163 |
| Clarence | Cedar County | 1 | 870 |
| Clarinda | Page County | 1 | 5,535 |
| Clarion | Wright County | 1 | 2,819 |
| Clark Township | Tama County | 2 | 1,744 |
| Clarksville | Butler County | 1 | 1,431 |
| Clay Township (Clay County) | Clay County | 4 | 654 |
| Clay Township (Grundy County) | Grundy County | 2 | 1,435 |
| Clay Township (Hardin County) | Hardin County | 3 | 454 |
| Clay Township (Harrison County) | Harrison County | 4 | 32 |
| Clay Township (Jones County) | Jones County | 5 | 202 |
| Clay Township (Marion County) | Marion County | 4 | 764 |
| Clay Township (Polk County) | Polk County | 3 | 20,686 |
| Clay Township (Shelby County) | Shelby County | 4 | 658 |
| Clay Township (Washington County) | Washington County | 3 | 176 |
| Clay Township (Wayne County) | Wayne County | 3 | 158 |
| Clay Township (Webster County) | Webster County | 5 | 122 |
| Clayton | Clayton County | 1 | 36 |
| Clayton Township (Clayton County) | Clayton County | 4 | 320 |
| Clayton Township (Taylor County) | Taylor County | 1 | 68 |
| Clear Creek Township (Jasper County) | Jasper County | 4 | 701 |
| Clear Creek Township (Johnson County) | Johnson County | 6 | 8,023 |
| Clear Creek Township (Keokuk County) | Keokuk County | 4 | 230 |
| Clear Lake | Cerro Gordo County | 1 | 7,765 |
| Clear Lake Township (Cerro Gordo County) | Cerro Gordo County | 2 | 1,475 |
| Clear Lake Township (Hamilton County) | Hamilton County | 3 | 782 |
| Clearfield | Taylor County | 1 | 404 |
| Cleghorn | Cherokee County | 1 | 183 |
| Clemons | Marshall County | 1 | 126 |
| Cleona Township | Scott County | 4 | 458 |
| Clermont | Fayette County | 1 | 714 |
| Clermont Township | Fayette County | 4 | 691 |
| Cleveland Township (Davis County) | Davis County | 1 | 680 |
| Cleveland Township (Lyon County) | Lyon County | 2 | 417 |
| Climbing Hill | Woodbury County | 1 | 102 |
| Clinton | Clinton County | 1 | 26,877 |
| Clinton Township (Linn County) | Linn County | 5 | 692 |
| Clinton Township (Ringgold County) | Ringgold County | 2 | 113 |
| Clinton Township (Sac County) | Sac County | 4 | 124 |
| Clinton Township (Wayne County) | Wayne County | 4 | 60 |
| Clio | Wayne County | 1 | 140 |
| Clive | Polk County | 1 | 15,557 |
| Clutier | Tama County | 1 | 208 |
| Coalville | Webster County | 2 | 593 |
| Coburg | Montgomery County | 1 | 22 |
| Coffins Grove Township | Delaware County | 3 | 555 |
| Coggon | Linn County | 1 | 768 |
| Coin | Page County | 1 | 229 |
| Coldwater Township | Butler County | 3 | 1,418 |
| Colesburg | Delaware County | 1 | 427 |
| Colfax | Jasper County | 1 | 2,210 |
| Colfax Township (Boone County) | Boone County | 3 | 986 |
| Colfax Township (Dallas County) | Dallas County | 3 | 345 |
| Colfax Township (Grundy County) | Grundy County | 3 | 555 |
| Colfax Township (Page County) | Page County | 2 | 219 |
| Colfax Township (Pocahontas County) | Pocahontas County | 3 | 217 |
| Colfax Township (Webster County) | Webster County | 4 | 140 |
| College Springs | Page County | 1 | 250 |
| College Township | Linn County | 4 | 539 |
| Collins | Story County | 1 | 516 |
| Collins Township | Story County | 2 | 746 |
| Colo | Story County | 1 | 881 |
| Colony Township (Adams County) | Adams County | 2 | 185 |
| Colony Township (Delaware County) | Delaware County | 4 | 752 |
| Columbia Township (Tama County) | Tama County | 1 | 215 |
| Columbia Township (Wapello County) | Wapello County | 2 | 921 |
| Columbus City | Louisa County | 1 | 279 |
| Columbus City Township | Louisa County | 2 | 2,910 |
| Columbus Junction | Louisa County | 1 | 2,122 |
| Colwell | Floyd County | 1 | 65 |
| Competine Township | Wapello County | 3 | 477 |
| Concord Township (Dubuque County) | Dubuque County | 4 | 769 |
| Concord Township (Hancock County) | Hancock County | 2 | 3,418 |
| Concord Township (Hardin County) | Hardin County | 4 | 356 |
| Concord Township (Louisa County) | Louisa County | 2 | 850 |
| Concord Township (Woodbury County) | Woodbury County | 3 | 1,414 |
| Concordia Township | Des Moines County | 1 | 732 |
| Conesville | Muscatine County | 1 | 489 |
| Cono Township | Buchanan County | 4 | 335 |
| Conrad | Grundy County | 1 | 1,088 |
| Conroy | Iowa County | 1 | 248 |
| Conway | Taylor County | 1 | 41 |
| Cook Township | Sac County | 3 | 223 |
| Coon Rapids | Carroll County | 1 | 1,330 |
| Coon Township | Buena Vista County | 2 | 239 |
| Coon Valley Township | Sac County | 4 | 264 |
| Cooper Township (Monona County) | Monona County | 3 | 674 |
| Cooper Township (Webster County) | Webster County | 1 | 815 |
| Coppock | Henry County | 2 | 77 |
| Coralville | Johnson County | 1 | 18,931 |
| Corinth Township | Humboldt County | 1 | 404 |
| Corley | Shelby County | 1 | 25 |
| Corning | Adams County | 1 | 1,603 |
| Correctionville | Woodbury County | 1 | 948 |
| Corwin Township | Ida County | 1 | 2,323 |
| Corwith | Hancock County | 1 | 274 |
| Corydon | Wayne County | 1 | 1,381 |
| Corydon Township | Wayne County | 3 | 1,929 |
| Cotter | Louisa County | 1 | 65 |
| Coulter | Franklin County | 2 | 420 |
| Council Bluffs | Pottawattamie County | 2 | 61,986 |
| Cox Creek Township | Clayton County | 4 | 134 |
| Craig | Plymouth County | 1 | 41 |
| Crawford Township (Madison County) | Madison County | 7 | 619 |
| Crawford Township (Washington County) | Washington County | 5 | 820 |
| Crawfordsville | Washington County | 1 | 283 |
| Crescent | Pottawattamie County | 1 | 622 |
| Crescent Township | Pottawattamie County | 4 | 1,451 |
| Cresco | Howard County | 1 | 3,873 |
| Cresco Township | Kossuth County | 4 | 928 |
| Creston | Union County | 1 | 7,821 |
| Crocker Township | Polk County | 3 | 63,724 |
| Cromwell | Union County | 1 | 69 |
| Crystal Lake | Hancock County | 1 | 202 |
| Crystal Township (Hancock County) | Hancock County | 4 | 342 |
| Crystal Township (Tama County) | Tama County | 4 | 225 |
| Cumberland | Cass County | 1 | 299 |
| Cumming | Warren County | 1 | 475 |
| Cummins Township | Pocahontas County | 3 | 232 |
| Curlew | Palo Alto County | 1 | 48 |
| Cushing | Woodbury County | 1 | 165 |
| Cylinder | Palo Alto County | 1 | 67 |
| Dahlonega Township | Wapello County | 1 | 807 |
| Dakota City | Humboldt County | 1 | 783 |
| Dale Township (Lyon County) | Lyon County | 3 | 266 |
| Dale Township (Obrien County) | Obrien County | 4 | 383 |
| Dallas Center | Dallas County | 1 | 1,785 |
| Dallas Township (Dallas County) | Dallas County | 5 | 361 |
| Dallas Township (Marion County) | Marion County | 5 | 1,499 |
| Dallas Township (Taylor County) | Taylor County | 2 | 654 |
| Dana | Greene County | 1 | 65 |
| Danbury | Woodbury County | 1 | 368 |
| Danville | Des Moines County | 1 | 878 |
| Danville Township (Des Moines County) | Des Moines County | 4 | 810 |
| Danville Township (Worth County) | Worth County | 3 | 285 |
| Davenport | Scott County | 6 | 99,781 |
| Davis City | Decatur County | 1 | 210 |
| Dawson | Dallas County | 1 | 157 |
| Dawson Township | Greene County | 4 | 91 |
| Dayton | Webster County | 1 | 956 |
| Dayton Township (Bremer County) | Bremer County | 3 | 257 |
| Dayton Township (Butler County) | Butler County | 3 | 201 |
| Dayton Township (Cedar County) | Cedar County | 4 | 1,300 |
| Dayton Township (Chickasaw County) | Chickasaw County | 2 | 1,726 |
| Dayton Township (Iowa County) | Iowa County | 3 | 371 |
| Dayton Township (Webster County) | Webster County | 3 | 1,291 |
| Dayton Township (Wright County) | Wright County | 2 | 205 |
| De Soto | Dallas County | 1 | 1,181 |
| Decatur | Decatur County | 1 | |
| Decatur City | Decatur County | 1 | 257 |
| Decatur Township | Decatur County | 3 | 292 |
| Decorah | Winneshiek County | 1 | 8,097 |
| Decorah Township | Winneshiek County | 1 | 9,740 |
| Dedham | Carroll County | 1 | 214 |
| Deep Creek Township | Clinton County | 5 | 634 |
| Deep River | Poweshiek County | 1 | 289 |
| Deep River Township | Poweshiek County | 1 | 426 |
| Deer Creek Township (Mills County) | Mills County | 3 | 249 |
| Deer Creek Township (Webster County) | Webster County | 3 | 305 |
| Deer Creek Township (Worth County) | Worth County | 2 | 177 |
| Deerfield Township | Chickasaw County | 4 | 309 |
| Defiance | Shelby County | 1 | 290 |
| Delana Township | Humboldt County | 4 | 507 |
| Delaware | Delaware County | 1 | 228 |
| Delaware Township (Delaware County) | Delaware County | 1 | 5,930 |
| Delaware Township (Polk County) | Polk County | 6 | 9,930 |
| Delaware Township (Sac County) | Sac County | 5 | 235 |
| Delhi | Delaware County | 1 | 413 |
| Delhi Township | Delaware County | 4 | 853 |
| Delmar | Clinton County | 1 | 453 |
| Deloit | Crawford County | 1 | 326 |
| Delphos | Ringgold County | 1 | 19 |
| Delta | Keokuk County | 1 | 408 |
| Denison | Crawford County | 1 | 8,253 |
| Denison Township | Crawford County | 2 | 8,787 |
| Denmark | Lee County | 1 | 310 |
| Denmark Township (Emmet County) | Emmet County | 2 | 519 |
| Denmark Township (Lee County) | Lee County | 4 | 899 |
| Denver | Bremer County | 1 | 1,833 |
| Derby | Lucas County | 1 | 109 |
| Des Moines | Polk County | 12 | 204,362 |
| Des Moines Township (Boone County) | Boone County | 1 | 13,539 |
| Des Moines Township (Dallas County) | Dallas County | 3 | 1,638 |
| Des Moines Township (Jasper County) | Jasper County | 3 | 2,617 |
| Des Moines Township (Jefferson County) | Jefferson County | 4 | 194 |
| Des Moines Township (Lee County) | Lee County | 4 | 755 |
| Des Moines Township (Pocahontas County) | Pocahontas County | 2 | 152 |
| Des Moines Township (Polk County) | Polk County | 10 | 102,485 |
| Des Moines Township (Van Buren County) | Van Buren County | 4 | 192 |
| Dewar | Black Hawk County | 1 | |
| DeWitt | Clinton County | 1 | 5,299 |
| DeWitt Township | Clinton County | 3 | 6,683 |
| Dexter | Dallas County | 1 | 695 |
| Diagonal | Ringgold County | 1 | 278 |
| Diamond Lake Township | Dickinson County | 3 | 390 |
| Diamond Township | Cherokee County | 4 | 140 |
| Diamondhead Lake | Guthrie County | 2 | 183 |
| Dickens | Clay County | 1 | 162 |
| Dike | Grundy County | 1 | 1,250 |
| Dixon | Scott County | 1 | 231 |
| Dodge Township (Boone County) | Boone County | 3 | 438 |
| Dodge Township (Dubuque County) | Dubuque County | 3 | 1,611 |
| Dodge Township (Guthrie County) | Guthrie County | 4 | 465 |
| Dodge Township (Union County) | Union County | 2 | 220 |
| Dolliver | Emmet County | 1 | 100 |
| Donahue | Scott County | 1 | 443 |
| Donnellson | Lee County | 1 | 1,071 |
| Doon | Lyon County | 1 | 544 |
| Doon Township | Lyon County | 4 | 1,293 |
| Dorchester | Allamakee County | 1 | |
| Douds | Van Buren County | 1 | 29 |
| Dougherty | Cerro Gordo County | 1 | 74 |
| Dougherty Township | Cerro Gordo County | 3 | 231 |
| Douglas Township (Adams County) | Adams County | 4 | 161 |
| Douglas Township (Appanoose County) | Appanoose County | 3 | 118 |
| Douglas Township (Audubon County) | Audubon County | 3 | 158 |
| Douglas Township (Boone County) | Boone County | 2 | 2,457 |
| Douglas Township (Bremer County) | Bremer County | 5 | 432 |
| Douglas Township (Clay County) | Clay County | 3 | 219 |
| Douglas Township (Harrison County) | Harrison County | 3 | 259 |
| Douglas Township (Ida County) | Ida County | 4 | 125 |
| Douglas Township (Madison County) | Madison County | 2 | 426 |
| Douglas Township (Mitchell County) | Mitchell County | 3 | 249 |
| Douglas Township (Montgomery County) | Montgomery County | 3 | 201 |
| Douglas Township (Page County) | Page County | 3 | 138 |
| Douglas Township (Polk County) | Polk County | 4 | 9,705 |
| Douglas Township (Sac County) | Sac County | 3 | 183 |
| Douglas Township (Shelby County) | Shelby County | 4 | 277 |
| Douglas Township (Union County) | Union County | 3 | 551 |
| Douglas Township (Webster County) | Webster County | 3 | 999 |
| Dover Township (Fayette County) | Fayette County | 5 | 425 |
| Dover Township (Pocahontas County) | Pocahontas County | 4 | 98 |
| Dow City | Crawford County | 1 | 606 |
| Downey | Cedar County | 1 | 87 |
| Dows | Franklin County | 1 | 532 |
| Doyle Township | Clarke County | 4 | 244 |
| Drakesville | Davis County | 1 | 176 |
| Drakesville Township | Davis County | 2 | 406 |
| Dresden Township | Chickasaw County | 2 | 560 |
| Dubuque | Dubuque County | 3 | 57,727 |
| Dubuque Township | Dubuque County | 4 | 7,968 |
| Dumont | Butler County | 1 | 708 |
| Duncan | Hancock County | 2 | 104 |
| Duncombe | Webster County | 1 | 453 |
| Dundee | Delaware County | 1 | 195 |
| Dunkerton | Black Hawk County | 1 | 799 |
| Dunlap | Harrison County | 1 | 1,263 |
| Durango | Dubuque County | 1 | 21 |
| Durant | Cedar County | 1 | 1,889 |
| Dutch Creek Township | Washington County | 4 | 489 |
| Dyersville | Dubuque County | 1 | 4,093 |
| Dysart | Tama County | 1 | 1,514 |
| Eagle Grove | Wright County | 1 | 3,556 |
| Eagle Grove Township | Wright County | 4 | 3,958 |
| Eagle Township (Black Hawk County) | Black Hawk County | 4 | 250 |
| Eagle Township (Kossuth County) | Kossuth County | 2 | 81 |
| Eagle Township (Sioux County) | Sioux County | 2 | 156 |
| Earlham | Madison County | 1 | 1,736 |
| Earling | Shelby County | 1 | 545 |
| Earlville | Delaware County | 1 | 787 |
| Early | Sac County | 1 | 556 |
| East Amana | Iowa County | 1 | 60 |
| East Boyer Township | Crawford County | 2 | 257 |
| East Des Moines Township | Mahaska County | 2 | 70 |
| East Holman Township | Osceola County | 2 | 1,182 |
| East Lancaster Township | Keokuk County | 2 | 61 |
| East Lincoln Township | Mitchell County | 3 | 284 |
| East Lucas Township | Johnson County | 1 | 791 |
| East Orange Township | Sioux County | 3 | 703 |
| East Peru | Madison County | 1 | 80 |
| East River Township | Page County | 2 | 233 |
| East Township | Montgomery County | 3 | 1,316 |
| East Waterloo Township | Black Hawk County | 2 | 997 |
| Eddyville | Mahaska County | 1 | 966 |
| Eden Township (Benton County) | Benton County | 3 | 337 |
| Eden Township (Carroll County) | Carroll County | 3 | 493 |
| Eden Township (Clinton County) | Clinton County | 6 | 634 |
| Eden Township (Decatur County) | Decatur County | 1 | 268 |
| Eden Township (Fayette County) | Fayette County | 3 | 662 |
| Eden Township (Marshall County) | Marshall County | 4 | 560 |
| Eden Township (Sac County) | Sac County | 3 | 172 |
| Eden Township (Winnebago County) | Winnebago County | 3 | 40 |
| Edgewood | Clayton County | 1 | 931 |
| Edna Township | Cass County | 1 | 61 |
| Elberon | Tama County | 1 | 172 |
| Eldon | Wapello County | 1 | 966 |
| Eldora | Hardin County | 1 | 2,727 |
| Eldora Township | Hardin County | 1 | 271 |
| Eldorado Township | Benton County | 4 | 1,289 |
| Eldridge | Scott County | 1 | 5,630 |
| Elgin | Fayette County | 1 | 765 |
| Elgin Township (Lyon County) | Lyon County | 1 | 493 |
| Elgin Township (Plymouth County) | Plymouth County | 1 | 362 |
| Eliot Township | Louisa County | 2 | 233 |
| Elk Creek Township | Jasper County | 3 | 551 |
| Elk Horn | Shelby County | 1 | 605 |
| Elk River Township | Clinton County | 5 | 921 |
| Elk Run Heights | Black Hawk County | 4 | 957 |
| Elk Township (Buena Vista County) | Buena Vista County | 2 | 156 |
| Elk Township (Clayton County) | Clayton County | 3 | 351 |
| Elk Township (Delaware County) | Delaware County | 4 | 599 |
| Elkader | Clayton County | 1 | 1,198 |
| Elkhart | Polk County | 1 | 565 |
| Elkhart Township | Polk County | 4 | 1,420 |
| Elkhorn Township (Plymouth County) | Plymouth County | 2 | 141 |
| Elkhorn Township (Webster County) | Webster County | 4 | 634 |
| Elkport | Clayton County | 1 | 102 |
| Ell Township | Hancock County | 2 | 842 |
| Ellington Township (Hancock County) | Hancock County | 3 | 372 |
| Ellington Township (Palo Alto County) | Palo Alto County | 2 | 86 |
| Elliott | Montgomery County | 1 | 319 |
| Ellis Township | Hardin County | 2 | 325 |
| Ellston | Ringgold County | 1 | 45 |
| Ellsworth | Hamilton County | 1 | 641 |
| Ellsworth Township (Emmet County) | Emmet County | 2 | 93 |
| Ellsworth Township (Hamilton County) | Hamilton County | 4 | 458 |
| Elm Grove Township (Calhoun County) | Calhoun County | 4 | 22 |
| Elm Grove Township (Louisa County) | Louisa County | 3 | 204 |
| Elma | Howard County | 1 | 623 |
| Ely | Linn County | 1 | 1,714 |
| Emerson | Mills County | 1 | 401 |
| Emmet Township | Emmet County | 1 | 290 |
| Emmetsburg | Palo Alto County | 1 | 3,874 |
| Emmetsburg Township | Palo Alto County | 2 | 3,207 |
| English River Township (Keokuk County) | Keokuk County | 3 | 468 |
| English River Township (Washington County) | Washington County | 4 | 3,661 |
| English Township (Iowa County) | Iowa County | 3 | 1,447 |
| English Township (Lucas County) | Lucas County | 3 | 533 |
| Epworth | Dubuque County | 1 | 1,993 |
| Erin Township | Hancock County | 2 | 83 |
| Essex | Page County | 1 | 899 |
| Estherville | Emmet County | 1 | 6,318 |
| Estherville Township | Emmet County | 1 | 6,263 |
| Etna Township | Hardin County | 2 | 1,852 |
| Eureka Township (Adair County) | Adair County | 4 | 99 |
| Eureka Township (Sac County) | Sac County | 2 | 772 |
| Evansdale | Black Hawk County | 1 | 4,741 |
| Everly | Clay County | 1 | 595 |
| Ewoldt Township | Carroll County | 1 | 271 |
| Excelsior Township | Dickinson County | 2 | 94 |
| Exira | Audubon County | 1 | 802 |
| Exira Township | Audubon County | 2 | 1,070 |
| Exline | Appanoose County | 1 | 126 |
| Fabius Township | Davis County | 2 | 161 |
| Fairbank | Buchanan County | 1 | 1,181 |
| Fairbank Township | Buchanan County | 2 | 2,007 |
| Fairfax | Linn County | 1 | 2,076 |
| Fairfax Township | Linn County | 3 | 4,501 |
| Fairfield | Jefferson County | 1 | 9,462 |
| Fairfield Township (Buena Vista County) | Buena Vista County | 1 | 813 |
| Fairfield Township (Cedar County) | Cedar County | 3 | 146 |
| Fairfield Township (Fayette County) | Fayette County | 4 | 586 |
| Fairfield Township (Grundy County) | Grundy County | 3 | 484 |
| Fairfield Township (Jackson County) | Jackson County | 4 | 235 |
| Fairfield Township (Palo Alto County) | Palo Alto County | 3 | 227 |
| Fairport | Muscatine County | 1 | 268 |
| Fairview Township (Allamakee County) | Allamakee County | 2 | 175 |
| Fairview Township (Jasper County) | Jasper County | 4 | 2,499 |
| Fairview Township (Jones County) | Jones County | 3 | 7,185 |
| Fairview Township (Monona County) | Monona County | 5 | 113 |
| Fairview Township (Osceola County) | Osceola County | 3 | 348 |
| Fairview Township (Shelby County) | Shelby County | 2 | 247 |
| Falls Township | Cerro Gordo County | 4 | 989 |
| Farley | Dubuque County | 1 | 1,572 |
| Farmers Creek Township | Jackson County | 4 | 441 |
| Farmersburg | Clayton County | 1 | 262 |
| Farmersburg Township | Clayton County | 4 | 866 |
| Farmington | Van Buren County | 1 | 772 |
| Farmington Township (Cedar County) | Cedar County | 4 | 2,170 |
| Farmington Township (Van Buren County) | Van Buren County | 2 | 766 |
| Farnhamville | Calhoun County | 1 | 326 |
| Farragut | Fremont County | 1 | 622 |
| Fayette | Fayette County | 1 | 1,348 |
| Fayette Township (Decatur County) | Decatur County | 1 | 135 |
| Fayette Township (Linn County) | Linn County | 6 | 1,352 |
| Felix Township | Grundy County | 2 | 217 |
| Fenton | Kossuth County | 1 | 334 |
| Fenton Township | Kossuth County | 2 | 408 |
| Ferguson | Marshall County | 1 | 128 |
| Fern Valley Township | Palo Alto County | 3 | 155 |
| Fertile | Worth County | 1 | 330 |
| Fertile Township | Worth County | 4 | 691 |
| Fillmore Township | Iowa County | 3 | 540 |
| Fisher Township | Fremont County | 2 | 631 |
| Flint River Township | Des Moines County | 4 | 1,722 |
| Florence Township | Benton County | 5 | 1,856 |
| Floris | Davis County | 1 | 176 |
| Floyd | Floyd County | 1 | 326 |
| Floyd Township (Floyd County) | Floyd County | 2 | 678 |
| Floyd Township (Obrien County) | Obrien County | 3 | 5,497 |
| Floyd Township (Sioux County) | Sioux County | 3 | 1,226 |
| Floyd Township (Woodbury County) | Woodbury County | 3 | 738 |
| Fonda | Pocahontas County | 1 | 605 |
| Fontanelle | Adair County | 1 | 663 |
| Forest City | Winnebago County | 1 | 4,142 |
| Forest City Township | Howard County | 1 | 783 |
| Forest Township | Winnebago County | 3 | 4,589 |
| Fort Atkinson | Winneshiek County | 1 | 357 |
| Fort Dodge | Webster County | 1 | 25,109 |
| Fort Madison | Lee County | 1 | 11,022 |
| Fostoria | Clay County | 1 | 72 |
| Four Mile Township | Polk County | 4 | 10,594 |
| Fox River Township | Davis County | 4 | 862 |
| Fox Township | Black Hawk County | 2 | 579 |
| Frankfort Township | Montgomery County | 3 | 273 |
| Franklin | Lee County | 1 | 94 |
| Franklin Township (Allamakee County) | Allamakee County | 4 | 401 |
| Franklin Township (Appanoose County) | Appanoose County | 3 | 316 |
| Franklin Township (Bremer County) | Bremer County | 3 | 471 |
| Franklin Township (Cass County) | Cass County | 2 | 216 |
| Franklin Township (Clarke County) | Clarke County | 3 | 153 |
| Franklin Township (Decatur County) | Decatur County | 2 | 356 |
| Franklin Township (Des Moines County) | Des Moines County | 5 | 978 |
| Franklin Township (Greene County) | Greene County | 3 | 102 |
| Franklin Township (Lee County) | Lee County | 2 | 1,368 |
| Franklin Township (Linn County) | Linn County | 3 | 7,383 |
| Franklin Township (Marion County) | Marion County | 4 | 214 |
| Franklin Township (Monona County) | Monona County | 2 | 187 |
| Franklin Township (Monroe County) | Monroe County | 3 | 75 |
| Franklin Township (Obrien County) | Obrien County | 2 | 1,493 |
| Franklin Township (Polk County) | Polk County | 4 | 5,762 |
| Franklin Township (Story County) | Story County | 4 | 24,043 |
| Franklin Township (Washington County) | Washington County | 4 | 263 |
| Frankville Township | Winneshiek County | 5 | 502 |
| Fraser | Boone County | 3 | 117 |
| Fredericksburg | Chickasaw County | 1 | 918 |
| Fredericksburg Township | Chickasaw County | 2 | 1,040 |
| Frederika | Bremer County | 2 | 140 |
| Frederika Township | Bremer County | 3 | 478 |
| Fredonia | Louisa County | 1 | 298 |
| Fredonia Township | Plymouth County | 4 | 275 |
| Freedom Township (Hamilton County) | Hamilton County | 1 | 395 |
| Freedom Township (Palo Alto County) | Palo Alto County | 2 | 954 |
| Freeman Township | Clay County | 2 | 392 |
| Fremont | Mahaska County | 1 | 719 |
| Fremont Township (Benton County) | Benton County | 3 | 2,763 |
| Fremont Township (Bremer County) | Bremer County | 5 | 1,772 |
| Fremont Township (Buchanan County) | Buchanan County | 3 | 157 |
| Fremont Township (Butler County) | Butler County | 3 | 519 |
| Fremont Township (Cedar County) | Cedar County | 3 | 1,108 |
| Fremont Township (Clarke County) | Clarke County | 2 | 491 |
| Fremont Township (Fayette County) | Fayette County | 5 | 571 |
| Fremont Township (Hamilton County) | Hamilton County | 4 | 192 |
| Fremont Township (Johnson County) | Johnson County | 3 | 1,667 |
| Fremont Township (Page County) | Page County | 2 | 242 |
| Fremont Township (Winneshiek County) | Winneshiek County | 2 | 194 |
| French Creek Township | Allamakee County | 4 | 216 |
| Fruitland | Muscatine County | 1 | 1,356 |
| Fruitland Township | Muscatine County | 2 | 2,589 |
| Frytown | Johnson County | 1 | 78 |
| Fulton Township (Muscatine County) | Muscatine County | 4 | 761 |
| Fulton Township (Webster County) | Webster County | 3 | 406 |
| Galt | Wright County | 1 | 49 |
| Galva | Ida County | 1 | 552 |
| Galva Township | Ida County | 2 | 532 |
| Garber | Clayton County | 1 | 80 |
| Garden City | Hardin County | 1 | 52 |
| Garden Grove | Decatur County | 1 | 191 |
| Garden Grove Township | Decatur County | 3 | 309 |
| Garden Township | Boone County | 3 | 1,309 |
| Garfield Township (Calhoun County) | Calhoun County | 3 | 255 |
| Garfield Township (Clay County) | Clay County | 2 | 235 |
| Garfield Township (Hancock County) | Hancock County | 2 | 297 |
| Garfield Township (Ida County) | Ida County | 3 | 98 |
| Garfield Township (Kossuth County) | Kossuth County | 2 | 146 |
| Garfield Township (Lyon County) | Lyon County | 4 | 207 |
| Garfield Township (Mahaska County) | Mahaska County | 2 | 1,513 |
| Garfield Township (Montgomery County) | Montgomery County | 2 | 196 |
| Garfield Township (Plymouth County) | Plymouth County | 2 | 1,666 |
| Garfield Township (Pocahontas County) | Pocahontas County | 4 | 196 |
| Garfield Township (Sioux County) | Sioux County | 4 | 282 |
| Garnavillo | Clayton County | 1 | 854 |
| Garnavillo Township | Clayton County | 4 | 816 |
| Garner | Hancock County | 1 | 3,109 |
| Garner Township | Pottawattamie County | 1 | 9,001 |
| Garrison | Benton County | 1 | 349 |
| Garwin | Tama County | 1 | 631 |
| Gay Township | Taylor County | 3 | 41 |
| Geneseo Township (Cerro Gordo County) | Cerro Gordo County | 2 | 1,074 |
| Geneseo Township (Tama County) | Tama County | 4 | 347 |
| Geneva | Franklin County | 1 | 155 |
| Geneva Township | Franklin County | 3 | 296 |
| George | Lyon County | 1 | 1,018 |
| German Township (Grundy County) | Grundy County | 3 | 287 |
| German Township (Kossuth County) | Kossuth County | 3 | 85 |
| Giard Township | Clayton County | 3 | 308 |
| Gibson | Keokuk County | 1 | 51 |
| Gifford | Hardin County | 1 | |
| Gilbert | Story County | 1 | 1,112 |
| Gilbertville | Black Hawk County | 1 | 772 |
| Gillett Grove | Clay County | 1 | 74 |
| Gillett Grove Township | Clay County | 4 | 313 |
| Gilman | Marshall County | 1 | 644 |
| Gilman Township | Osceola County | 2 | 679 |
| Gilmore City | Pocahontas County | 1 | 437 |
| Gladbrook | Tama County | 1 | 935 |
| Glenwood | Mills County | 1 | 5,276 |
| Glenwood Township (Mills County) | Mills County | 2 | 6,401 |
| Glenwood Township (Winneshiek County) | Winneshiek County | 2 | 575 |
| Glidden | Carroll County | 1 | 1,274 |
| Glidden Township | Carroll County | 2 | 1,151 |
| Goewey Township | Osceola County | 4 | 133 |
| Goldfield | Wright County | 1 | 651 |
| Goodell | Hancock County | 1 | 153 |
| Goodrich Township | Crawford County | 2 | 148 |
| Goose Lake | Clinton County | 1 | 222 |
| Goshen Township | Muscatine County | 3 | 695 |
| Gower Township | Cedar County | 3 | 499 |
| Gowrie | Webster County | 1 | 1,224 |
| Gowrie Township | Webster County | 1 | 961 |
| Graettinger | Palo Alto County | 1 | 890 |
| Graf | Dubuque County | 1 | 57 |
| Grafton | Worth County | 1 | 244 |
| Graham Township | Johnson County | 3 | 580 |
| Grand Junction | Greene County | 1 | 864 |
| Grand Meadow Township (Cherokee County) | Cherokee County | 5 | 196 |
| Grand Meadow Township (Clayton County) | Clayton County | 4 | 578 |
| Grand Mound | Clinton County | 1 | 586 |
| Grand River | Decatur County | 1 | 290 |
| Grand River Township (Adair County) | Adair County | 3 | 97 |
| Grand River Township (Decatur County) | Decatur County | 3 | 31 |
| Grand River Township (Madison County) | Madison County | 3 | 240 |
| Grand River Township (Wayne County) | Wayne County | 2 | 308 |
| Grandview | Louisa County | 1 | 484 |
| Grandview Township | Louisa County | 5 | 1,150 |
| Grange Township | Woodbury County | 3 | 189 |
| Granger | Dallas County | 1 | 1,301 |
| Grant | Montgomery County | 1 | 71 |
| Grant Township (Adams County) | Adams County | 1 | 206 |
| Grant Township (Boone County) | Boone County | 5 | 321 |
| Grant Township (Buena Vista County) | Buena Vista County | 3 | 325 |
| Grant Township (Carroll County) | Carroll County | 3 | 446 |
| Grant Township (Cass County) | Cass County | 2 | 1,046 |
| Grant Township (Cerro Gordo County) | Cerro Gordo County | 3 | 388 |
| Grant Township (Clinton County) | Clinton County | 4 | 219 |
| Grant Township (Dallas County) | Dallas County | 4 | 2,185 |
| Grant Township (Franklin County) | Franklin County | 5 | 410 |
| Grant Township (Greene County) | Greene County | 1 | 216 |
| Grant Township (Grundy County) | Grundy County | 4 | 1,803 |
| Grant Township (Guthrie County) | Guthrie County | 3 | 251 |
| Grant Township (Hardin County) | Hardin County | 2 | 181 |
| Grant Township (Ida County) | Ida County | 2 | 144 |
| Grant Township (Kossuth County) | Kossuth County | 2 | 116 |
| Grant Township (Linn County) | Linn County | 2 | 1,403 |
| Grant Township (Lyon County) | Lyon County | 4 | 228 |
| Grant Township (Monona County) | Monona County | 4 | 196 |
| Grant Township (Montgomery County) | Montgomery County | 2 | 335 |
| Grant Township (Obrien County) | Obrien County | 2 | 169 |
| Grant Township (Page County) | Page County | 2 | 5,192 |
| Grant Township (Plymouth County) | Plymouth County | 2 | 329 |
| Grant Township (Pocahontas County) | Pocahontas County | 2 | 115 |
| Grant Township (Poweshiek County) | Poweshiek County | 1 | 509 |
| Grant Township (Ringgold County) | Ringgold County | 3 | 176 |
| Grant Township (Sioux County) | Sioux County | 4 | 507 |
| Grant Township (Story County) | Story County | 2 | 1,535 |
| Grant Township (Tama County) | Tama County | 3 | 308 |
| Grant Township (Taylor County) | Taylor County | 2 | 531 |
| Grant Township (Union County) | Union County | 4 | 312 |
| Grant Township (Winnebago County) | Winnebago County | 3 | 117 |
| Grant Township (Woodbury County) | Woodbury County | 3 | 139 |
| Grant Township (Wright County) | Wright County | 3 | 1,387 |
| Granville | Sioux County | 1 | 432 |
| Gravity | Taylor County | 1 | 147 |
| Gray | Audubon County | 1 | 71 |
| Great Oak Township | Palo Alto County | 3 | 142 |
| Greeley | Delaware County | 1 | 308 |
| Greeley Township (Audubon County) | Audubon County | 2 | 171 |
| Greeley Township (Shelby County) | Shelby County | 3 | 200 |
| Green Bay Township (Clarke County) | Clarke County | 2 | 402 |
| Green Bay Township (Lee County) | Lee County | 1 | 686 |
| Green Mountain | Marshall County | 2 | 148 |
| Green Township (Fremont County) | Fremont County | 3 | 361 |
| Green Township (Wapello County) | Wapello County | 4 | 867 |
| Greenbrier Township | Greene County | 3 | 206 |
| Greencastle Township | Marshall County | 3 | 920 |
| Greene | Butler County | 1 | 1,156 |
| Greene Township | Iowa County | 4 | 285 |
| Greenfield | Adair County | 1 | 1,989 |
| Greenfield Township (Adair County) | Adair County | 1 | 1,738 |
| Greenfield Township (Calhoun County) | Calhoun County | 4 | 292 |
| Greenfield Township (Jones County) | Jones County | 5 | 877 |
| Greenfield Township (Warren County) | Warren County | 4 | 7,676 |
| Greenville | Clay County | 1 | 83 |
| Greenwood Township | Kossuth County | 2 | 751 |
| Griggs Township | Ida County | 1 | 1,567 |
| Grimes | Polk County | 1 | 8,341 |
| Grimes Township | Cerro Gordo County | 2 | 905 |
| Grinnell | Poweshiek County | 1 | 9,205 |
| Griswold | Cass County | 1 | 924 |
| Grove Township (Adair County) | Adair County | 3 | 125 |
| Grove Township (Cass County) | Cass County | 1 | 7,240 |
| Grove Township (Davis County) | Davis County | 1 | 600 |
| Grove Township (Humboldt County) | Humboldt County | 3 | 165 |
| Grove Township (Pottawattamie County) | Pottawattamie County | 4 | 81 |
| Grove Township (Shelby County) | Shelby County | 3 | 45 |
| Grove Township (Taylor County) | Taylor County | 3 | 200 |
| Grove Township (Worth County) | Worth County | 1 | 2,456 |
| Grundy Center | Grundy County | 1 | 2,694 |
| Gruver | Emmet County | 1 | 65 |
| Guernsey | Poweshiek County | 1 | 61 |
| Guilford Township | Monroe County | 2 | 208 |
| Guthrie Center | Guthrie County | 1 | 1,682 |
| Guttenberg | Clayton County | 1 | 1,874 |
| Halbur | Carroll County | 1 | 166 |
| Hale Township | Jones County | 4 | 152 |
| Hamburg | Fremont County | 1 | 1,149 |
| Hamilton | Marion County | 1 | 191 |
| Hamilton Township (Decatur County) | Decatur County | 3 | 126 |
| Hamilton Township (Franklin County) | Franklin County | 4 | 85 |
| Hamilton Township (Hamilton County) | Hamilton County | 4 | 52 |
| Hamlin | Audubon County | 1 | |
| Hamlin Township | Audubon County | 3 | 203 |
| Hampshire Township | Clinton County | 2 | 691 |
| Hampton | Franklin County | 1 | 4,438 |
| Hancock | Pottawattamie County | 1 | 190 |
| Hancock Township | Plymouth County | 3 | 342 |
| Hanlontown | Worth County | 1 | 162 |
| Hanover Township (Allamakee County) | Allamakee County | 3 | 192 |
| Hanover Township (Crawford County) | Crawford County | 4 | 190 |
| Hansell | Franklin County | 1 | 107 |
| Harcourt | Webster County | 1 | 311 |
| Hardin Township (Greene County) | Greene County | 2 | 245 |
| Hardin Township (Hardin County) | Hardin County | 4 | 5,817 |
| Hardin Township (Johnson County) | Johnson County | 3 | 387 |
| Hardin Township (Pottawattamie County) | Pottawattamie County | 3 | 1,185 |
| Hardin Township (Webster County) | Webster County | 2 | 133 |
| Hardy | Humboldt County | 1 | 81 |
| Harlan | Shelby County | 1 | 5,098 |
| Harlan Township (Fayette County) | Fayette County | 5 | 803 |
| Harlan Township (Page County) | Page County | 2 | 243 |
| Harper | Keokuk County | 1 | 92 |
| Harpers Ferry | Allamakee County | 1 | 342 |
| Harris | Osceola County | 1 | 154 |
| Harrisburg Township | Van Buren County | 3 | 172 |
| Harrison Township (Adair County) | Adair County | 3 | 189 |
| Harrison Township (Benton County) | Benton County | 5 | 510 |
| Harrison Township (Boone County) | Boone County | 3 | 372 |
| Harrison Township (Harrison County) | Harrison County | 2 | 1,319 |
| Harrison Township (Kossuth County) | Kossuth County | 2 | 810 |
| Harrison Township (Lee County) | Lee County | 2 | 212 |
| Harrison Township (Mahaska County) | Mahaska County | 3 | 633 |
| Harrison Township (Osceola County) | Osceola County | 3 | 151 |
| Hartford | Warren County | 1 | 672 |
| Hartford Township | Iowa County | 3 | 1,204 |
| Hartland Township | Worth County | 1 | 210 |
| Hartley | Obrien County | 1 | 1,710 |
| Hartley Township | Obrien County | 1 | 1,771 |
| Hartwick | Poweshiek County | 1 | 60 |
| Harvey | Marion County | 1 | 312 |
| Hastings | Mills County | 1 | 221 |
| Havelock | Pocahontas County | 1 | 143 |
| Haverhill | Marshall County | 1 | 195 |
| Hawarden | Sioux County | 1 | 2,545 |
| Hawkeye | Fayette County | 1 | 408 |
| Hayes Township (Buena Vista County) | Buena Vista County | 2 | 1,220 |
| Hayes Township (Crawford County) | Crawford County | 4 | 183 |
| Hayes Township (Ida County) | Ida County | 3 | 199 |
| Hayesville | Keokuk County | 1 | 42 |
| Hayfield | Hancock County | 1 | 54 |
| Hazel Dell Township | Pottawattamie County | 4 | 1,351 |
| Hazel Green Township | Delaware County | 5 | 357 |
| Hazleton | Buchanan County | 1 | 978 |
| Hazleton Township | Buchanan County | 3 | 1,016 |
| Hebron Township | Kossuth County | 3 | 172 |
| Hedrick | Keokuk County | 1 | 974 |
| Henderson | Mills County | 1 | 148 |
| Henry Township (Plymouth County) | Plymouth County | 2 | 123 |
| Henry Township (Van Buren County) | Van Buren County | 2 | 212 |
| Hepburn | Page County | 1 | 64 |
| Herdland Township | Clay County | 3 | 185 |
| Hesper Township | Winneshiek County | 1 | 257 |
| Hiawatha | Linn County | 1 | 7,046 |
| Hickory Grove Township (Jasper County) | Jasper County | 3 | 281 |
| Hickory Grove Township (Scott County) | Scott County | 6 | 694 |
| High Amana | Iowa County | 1 | 102 |
| High Lake Township | Emmet County | 3 | 541 |
| High Point Township | Decatur County | 3 | 243 |
| Highland Township (Clayton County) | Clayton County | 4 | 162 |
| Highland Township (Greene County) | Greene County | 2 | 560 |
| Highland Township (Guthrie County) | Guthrie County | 2 | 508 |
| Highland Township (Obrien County) | Obrien County | 3 | 237 |
| Highland Township (Palo Alto County) | Palo Alto County | 2 | 1,022 |
| Highland Township (Tama County) | Tama County | 3 | 173 |
| Highland Township (Union County) | Union County | 2 | 275 |
| Highland Township (Wapello County) | Wapello County | 2 | 226 |
| Highland Township (Washington County) | Washington County | 3 | 228 |
| Highland Township (Winneshiek County) | Winneshiek County | 2 | 251 |
| Highlandville | Winneshiek County | 1 | |
| Hills | Johnson County | 1 | 824 |
| Hillsboro | Henry County | 1 | 252 |
| Hilton Township | Iowa County | 4 | 515 |
| Hinton | Plymouth County | 1 | 840 |
| Holiday Lake | Poweshiek County | 1 | 595 |
| Holland | Grundy County | 1 | 272 |
| Holland Township | Sioux County | 4 | 6,006 |
| Holstein | Ida County | 1 | 1,450 |
| Holt Township | Taylor County | 3 | 71 |
| Holy Cross | Dubuque County | 1 | 373 |
| Homer Township (Benton County) | Benton County | 4 | 133 |
| Homer Township (Buchanan County) | Buchanan County | 3 | 569 |
| Homestead | Iowa County | 1 | 125 |
| Honey Creek Township (Delaware County) | Delaware County | 4 | 919 |
| Honey Creek Township (Iowa County) | Iowa County | 5 | 287 |
| Hopkinton | Delaware County | 1 | 616 |
| Hornick | Woodbury County | 1 | 187 |
| Horton Township | Osceola County | 1 | 153 |
| Hospers | Sioux County | 1 | 731 |
| Houghton | Lee County | 3 | 149 |
| Howard Center Township | Howard County | 2 | 254 |
| Howard Township (Howard County) | Howard County | 2 | 387 |
| Howard Township (Story County) | Story County | 3 | 2,266 |
| Howard Township (Tama County) | Tama County | 2 | 215 |
| Howard Township (Wayne County) | Wayne County | 2 | 55 |
| Hubbard | Hardin County | 1 | 788 |
| Hudson | Black Hawk County | 1 | 2,366 |
| Hull | Sioux County | 1 | 2,152 |
| Humboldt | Humboldt County | 1 | 4,671 |
| Humboldt Township | Humboldt County | 3 | 582 |
| Humeston | Wayne County | 1 | 445 |
| Hungerford Township | Plymouth County | 2 | 2,140 |
| Huron Township | Des Moines County | 2 | 252 |
| Hutchins | Hancock County | 1 | 0 |
| Huxley | Story County | 1 | 3,270 |
| Ida Grove | Ida County | 1 | 2,153 |
| Illyria Township | Fayette County | 5 | 380 |
| Imogene | Fremont County | 1 | 71 |
| Independence | Buchanan County | 1 | 5,988 |
| Independence Township (Appanoose County) | Appanoose County | 4 | 299 |
| Independence Township (Hamilton County) | Hamilton County | 2 | 410 |
| Independence Township (Jasper County) | Jasper County | 4 | 1,377 |
| Independence Township (Palo Alto County) | Palo Alto County | 4 | 109 |
| Indian Creek Township (Mills County) | Mills County | 3 | 834 |
| Indian Creek Township (Story County) | Story County | 2 | 1,670 |
| Indian Village Township | Tama County | 5 | 1,141 |
| Indiana Township | Marion County | 5 | 747 |
| Indianola | Warren County | 1 | 14,787 |
| Ingham Township | Franklin County | 3 | 340 |
| Ingraham Township | Mills County | 3 | 739 |
| Inland Township | Cedar County | 3 | 895 |
| Inwood | Lyon County | 1 | 850 |
| Ionia | Chickasaw County | 1 | 351 |
| Iowa City | Johnson County | 4 | 68,364 |
| Iowa Falls | Hardin County | 1 | 5,186 |
| Iowa Lake Township | Emmet County | 2 | 133 |
| Iowa Township (Allamakee County) | Allamakee County | 2 | 854 |
| Iowa Township (Benton County) | Benton County | 3 | 446 |
| Iowa Township (Cedar County) | Cedar County | 5 | 511 |
| Iowa Township (Crawford County) | Crawford County | 3 | 217 |
| Iowa Township (Dubuque County) | Dubuque County | 5 | 604 |
| Iowa Township (Iowa County) | Iowa County | 4 | 559 |
| Iowa Township (Jackson County) | Jackson County | 3 | 762 |
| Iowa Township (Washington County) | Washington County | 3 | 2,888 |
| Iowa Township (Wright County) | Wright County | 3 | 272 |
| Ira | Jasper County | 1 | |
| Ireton | Sioux County | 1 | 749 |
| Irvington | Kossuth County | 2 | 16 |
| Irvington Township | Kossuth County | 2 | 188 |
| Irwin | Shelby County | 1 | 389 |
| Jack Creek Township | Emmet County | 2 | 25 |
| Jackson Junction | Winneshiek County | 2 | 88 |
| Jackson Township (Adair County) | Adair County | 3 | 291 |
| Jackson Township (Benton County) | Benton County | 2 | 813 |
| Jackson Township (Boone County) | Boone County | 2 | 1,041 |
| Jackson Township (Bremer County) | Bremer County | 3 | 1,827 |
| Jackson Township (Butler County) | Butler County | 2 | 471 |
| Jackson Township (Calhoun County) | Calhoun County | 2 | 158 |
| Jackson Township (Clarke County) | Clarke County | 2 | 473 |
| Jackson Township (Crawford County) | Crawford County | 4 | 166 |
| Jackson Township (Des Moines County) | Des Moines County | 2 | 165 |
| Jackson Township (Greene County) | Greene County | 2 | 269 |
| Jackson Township (Guthrie County) | Guthrie County | 6 | 358 |
| Jackson Township (Hardin County) | Hardin County | 4 | 121 |
| Jackson Township (Harrison County) | Harrison County | 4 | 508 |
| Jackson Township (Henry County) | Henry County | 3 | 715 |
| Jackson Township (Jackson County) | Jackson County | 3 | 632 |
| Jackson Township (Jones County) | Jones County | 4 | 320 |
| Jackson Township (Keokuk County) | Keokuk County | 4 | 383 |
| Jackson Township (Lee County) | Lee County | 3 | 1,829 |
| Jackson Township (Linn County) | Linn County | 3 | 1,603 |
| Jackson Township (Lucas County) | Lucas County | 3 | 368 |
| Jackson Township (Madison County) | Madison County | 3 | 208 |
| Jackson Township (Monroe County) | Monroe County | 2 | 365 |
| Jackson Township (Poweshiek County) | Poweshiek County | 3 | 1,705 |
| Jackson Township (Sac County) | Sac County | 3 | 2,076 |
| Jackson Township (Shelby County) | Shelby County | 3 | 207 |
| Jackson Township (Taylor County) | Taylor County | 2 | 24 |
| Jackson Township (Van Buren County) | Van Buren County | 2 | 1,177 |
| Jackson Township (Warren County) | Warren County | 5 | 904 |
| Jackson Township (Washington County) | Washington County | 4 | 510 |
| Jackson Township (Wayne County) | Wayne County | 3 | 234 |
| Jackson Township (Webster County) | Webster County | 2 | 339 |
| Jackson Township (Winneshiek County) | Winneshiek County | 3 | 159 |
| Jacksonville | Shelby County | 1 | 47 |
| Jacksonville Township | Chickasaw County | 2 | 334 |
| Jamaica | Guthrie County | 1 | 255 |
| James Township | Pottawattamie County | 3 | 141 |
| Jamestown Township | Howard County | 1 | 711 |
| Janesville | Bremer County | 1 | 986 |
| Jasper Township (Adams County) | Adams County | 1 | 393 |
| Jasper Township (Carroll County) | Carroll County | 5 | 228 |
| Jefferson | Greene County | 1 | 4,329 |
| Jefferson Township (Adair County) | Adair County | 3 | 168 |
| Jefferson Township (Allamakee County) | Allamakee County | 4 | 635 |
| Jefferson Township (Bremer County) | Bremer County | 2 | 3,046 |
| Jefferson Township (Buchanan County) | Buchanan County | 6 | 935 |
| Jefferson Township (Butler County) | Butler County | 4 | 270 |
| Jefferson Township (Clayton County) | Clayton County | 4 | 2,309 |
| Jefferson Township (Dubuque County) | Dubuque County | 3 | 1,114 |
| Jefferson Township (Fayette County) | Fayette County | 2 | 6,328 |
| Jefferson Township (Harrison County) | Harrison County | 3 | 2,326 |
| Jefferson Township (Henry County) | Henry County | 3 | 1,600 |
| Jefferson Township (Johnson County) | Johnson County | 4 | 4,603 |
| Jefferson Township (Lee County) | Lee County | 4 | 1,069 |
| Jefferson Township (Louisa County) | Louisa County | 1 | 231 |
| Jefferson Township (Madison County) | Madison County | 2 | 550 |
| Jefferson Township (Mahaska County) | Mahaska County | 4 | 388 |
| Jefferson Township (Marshall County) | Marshall County | 5 | 607 |
| Jefferson Township (Polk County) | Polk County | 4 | 13,070 |
| Jefferson Township (Poweshiek County) | Poweshiek County | 4 | 507 |
| Jefferson Township (Ringgold County) | Ringgold County | 2 | 111 |
| Jefferson Township (Shelby County) | Shelby County | 3 | 685 |
| Jefferson Township (Taylor County) | Taylor County | 2 | 171 |
| Jefferson Township (Warren County) | Warren County | 6 | 2,113 |
| Jefferson Township (Wayne County) | Wayne County | 3 | 27 |
| Jenkins Township | Mitchell County | 2 | 940 |
| Jesup | Buchanan County | 1 | 2,883 |
| Jewell | Hamilton County | 1 | |
| Jewell Junction | Hamilton County | 1 | 1,001 |
| Johns Township | Appanoose County | 4 | 260 |
| Johnson Township (Plymouth County) | Plymouth County | 3 | 329 |
| Johnson Township (Webster County) | Webster County | 5 | 557 |
| Johnston | Polk County | 1 | 17,316 |
| Joice | Worth County | 1 | 226 |
| Jolley | Calhoun County | 1 | 24 |
| Jones Township | Union County | 4 | 337 |
| Jordan Township | Monona County | 4 | 248 |
| Julien Township | Dubuque County | 1 | |
| Junction Township | Greene County | 5 | 999 |
| Kalona | Washington County | 1 | 2,544 |
| Kamrar | Hamilton County | 1 | 182 |
| Kanawha | Hancock County | 1 | 713 |
| Kane Township (Benton County) | Benton County | 3 | 927 |
| Kane Township (Pottawattamie County) | Pottawattamie County | 5 | 52,433 |
| Kedron Township | Woodbury County | 2 | 702 |
| Keg Creek Township | Pottawattamie County | 3 | 814 |
| Kellerton | Ringgold County | 1 | 444 |
| Kelley | Story County | 1 | 290 |
| Kellogg | Jasper County | 1 | 624 |
| Kellogg Township | Jasper County | 2 | 1,152 |
| Kendrick Township | Greene County | 2 | 111 |
| Kennebec Township | Monona County | 2 | 303 |
| Kensett | Worth County | 1 | 231 |
| Kensett Township | Worth County | 2 | 433 |
| Kent | Union County | 1 | 49 |
| Kent Estates | Muscatine County | 1 | 1,991 |
| Keokuk | Lee County | 1 | 10,757 |
| Keokuk Township | Wapello County | 3 | 763 |
| Keomah Village | Mahaska County | 1 | 82 |
| Keosauqua | Van Buren County | 1 | 1,240 |
| Keota | Keokuk County | 1 | 1,005 |
| Kesley | Butler County | 1 | |
| Keswick | Keokuk County | 1 | 244 |
| Keystone | Benton County | 1 | 638 |
| Killduff | Jasper County | 1 | |
| Kimballton | Audubon County | 1 | 329 |
| King Township | Winnebago County | 2 | 629 |
| Kingsley | Plymouth County | 1 | 1,381 |
| Kingston | Des Moines County | 1 | 13 |
| Kinross | Keokuk County | 1 | 60 |
| Kirkman | Shelby County | 1 | 61 |
| Kirkville | Wapello County | 1 | 121 |
| Kiron | Crawford County | 1 | 312 |
| Klemme | Hancock County | 1 | 666 |
| Knierim | Calhoun County | 1 | 123 |
| Kniest Township | Carroll County | 2 | 426 |
| Knox Township (Clarke County) | Clarke County | 3 | 160 |
| Knox Township (Pottawattamie County) | Pottawattamie County | 1 | 1,489 |
| Knoxville | Marion County | 1 | 7,353 |
| Knoxville Township | Marion County | 3 | 10,685 |
| La Grange Township | Harrison County | 3 | 369 |
| La Motte | Jackson County | 1 | 214 |
| La Porte City | Black Hawk County | 1 | 2,554 |
| Lacona | Warren County | 1 | 368 |
| Ladora | Iowa County | 1 | 205 |
| Lafayette Township (Allamakee County) | Allamakee County | 2 | 353 |
| Lafayette Township (Bremer County) | Bremer County | 2 | 674 |
| Lafayette Township (Keokuk County) | Keokuk County | 3 | 1,203 |
| Lafayette Township (Story County) | Story County | 3 | 3,238 |
| Lake City | Calhoun County | 1 | 1,597 |
| Lake Creek Township | Calhoun County | 2 | 244 |
| Lake Mills | Winnebago County | 1 | 1,925 |
| Lake Panorama | Guthrie County | 3 | 1,100 |
| Lake Park | Dickinson County | 1 | 1,204 |
| Lake Prairie Township | Marion County | 3 | 12,262 |
| Lake Township (Cerro Gordo County) | Cerro Gordo County | 3 | 329 |
| Lake Township (Clay County) | Clay County | 3 | 167 |
| Lake Township (Humboldt County) | Humboldt County | 3 | 214 |
| Lake Township (Monona County) | Monona County | 3 | 118 |
| Lake Township (Muscatine County) | Muscatine County | 2 | 335 |
| Lake Township (Pocahontas County) | Pocahontas County | 3 | 268 |
| Lake Township (Pottawattamie County) | Pottawattamie County | 5 | 1,046 |
| Lake Township (Wright County) | Wright County | 1 | 306 |
| Lake View | Sac County | 1 | 1,292 |
| Lakeport Township | Woodbury County | 3 | 192 |
| Lakeside | Buena Vista County | 1 | 788 |
| Lakeville Township | Dickinson County | 5 | 1,348 |
| Lakota | Kossuth County | 1 | 300 |
| Lambs Grove | Jasper County | 1 | 177 |
| Lamoni | Decatur County | 1 | 2,708 |
| Lamont | Buchanan County | 1 | 426 |
| Lanesboro | Carroll County | 1 | 108 |
| Langworthy | Jones County | 1 | |
| Lansing | Allamakee County | 1 | 865 |
| Lansing Township | Allamakee County | 2 | 1,329 |
| Larchwood | Lyon County | 1 | 982 |
| Larchwood Township | Lyon County | 2 | 1,435 |
| Larrabee | Cherokee County | 1 | 101 |
| Latimer | Franklin County | 1 | 528 |
| Laurel | Marshall County | 1 | 273 |
| Laurens | Pocahontas County | 1 | 1,304 |
| Lawler | Chickasaw County | 1 | 346 |
| Lawton | Woodbury County | 1 | 1,012 |
| Layton Township | Pottawattamie County | 2 | 778 |
| Le Claire | Scott County | 1 | 3,737 |
| Le Claire Township | Scott County | 5 | 6,129 |
| Le Grand | Marshall County | 1 | 934 |
| Le Grand Township | Marshall County | 2 | 1,375 |
| Le Mars | Plymouth County | 1 | 9,765 |
| Le Roy | Decatur County | 1 | 2 |
| Le Roy Township | Bremer County | 3 | 188 |
| Leando | Van Buren County | 1 | 127 |
| Ledyard | Kossuth County | 1 | 130 |
| Ledyard Township | Kossuth County | 4 | 459 |
| Lee Township (Adair County) | Adair County | 1 | 119 |
| Lee Township (Buena Vista County) | Buena Vista County | 3 | 234 |
| Lee Township (Franklin County) | Franklin County | 2 | 220 |
| Lee Township (Madison County) | Madison County | 3 | 1,140 |
| Lee Township (Polk County) | Polk County | 8 | 62,713 |
| Lehigh | Webster County | 1 | 420 |
| Leighton | Mahaska County | 1 | 217 |
| Leland | Winnebago County | 1 | 356 |
| Lenox | Taylor County | 1 | 1,315 |
| Lenox Township | Iowa County | 5 | 2,594 |
| Leon | Decatur County | 1 | 1,921 |
| Leroy Township (Audubon County) | Audubon County | 1 | 2,266 |
| Leroy Township (Benton County) | Benton County | 3 | 1,094 |
| Lester | Lyon County | 1 | 326 |
| Lester Township | Black Hawk County | 3 | 1,393 |
| Letts | Louisa County | 1 | 472 |
| Levey Township | Sac County | 2 | 714 |
| Lewis | Cass County | 1 | 426 |
| Lewis Township | Pottawattamie County | 5 | 12,605 |
| Liberal Township | Lyon County | 3 | 337 |
| Liberty Center | Warren County | 1 | |
| Liberty Township (Buchanan County) | Buchanan County | 4 | 1,356 |
| Liberty Township (Cherokee County) | Cherokee County | 5 | 230 |
| Liberty Township (Clarke County) | Clarke County | 3 | 182 |
| Liberty Township (Clinton County) | Clinton County | 3 | 316 |
| Liberty Township (Dubuque County) | Dubuque County | 4 | 670 |
| Liberty Township (Hamilton County) | Hamilton County | 6 | 234 |
| Liberty Township (Hancock County) | Hancock County | 3 | 194 |
| Liberty Township (Jefferson County) | Jefferson County | 4 | 561 |
| Liberty Township (Johnson County) | Johnson County | 3 | 1,171 |
| Liberty Township (Keokuk County) | Keokuk County | 4 | 357 |
| Liberty Township (Lucas County) | Lucas County | 2 | 374 |
| Liberty Township (Marion County) | Marion County | 3 | 824 |
| Liberty Township (Marshall County) | Marshall County | 3 | 123 |
| Liberty Township (Mitchell County) | Mitchell County | 3 | 65 |
| Liberty Township (Obrien County) | Obrien County | 4 | 362 |
| Liberty Township (Plymouth County) | Plymouth County | 3 | 209 |
| Liberty Township (Ringgold County) | Ringgold County | 1 | 26 |
| Liberty Township (Scott County) | Scott County | 4 | 619 |
| Liberty Township (Warren County) | Warren County | 5 | 349 |
| Liberty Township (Woodbury County) | Woodbury County | 3 | 1,098 |
| Liberty Township (Wright County) | Wright County | 2 | 709 |
| Libertyville | Jefferson County | 1 | 403 |
| Lick Creek Township (Davis County) | Davis County | 2 | 672 |
| Lick Creek Township (Van Buren County) | Van Buren County | 2 | 545 |
| Lidderdale | Carroll County | 1 | 184 |
| Lime Creek Township (Cerro Gordo County) | Cerro Gordo County | 1 | 338 |
| Lime Creek Township (Washington County) | Washington County | 2 | 2,399 |
| Lime Springs | Howard County | 1 | 482 |
| Lincoln | Tama County | 1 | 171 |
| Lincoln Township (Adair County) | Adair County | 2 | 937 |
| Lincoln Township (Adams County) | Adams County | 3 | 46 |
| Lincoln Township (Appanoose County) | Appanoose County | 2 | 103 |
| Lincoln Township (Audubon County) | Audubon County | 3 | 223 |
| Lincoln Township (Black Hawk County) | Black Hawk County | 3 | 492 |
| Lincoln Township (Buena Vista County) | Buena Vista County | 4 | 73 |
| Lincoln Township (Calhoun County) | Calhoun County | 1 | 1,860 |
| Lincoln Township (Cass County) | Cass County | 2 | 18 |
| Lincoln Township (Cerro Gordo County) | Cerro Gordo County | 4 | 325 |
| Lincoln Township (Clay County) | Clay County | 5 | 209 |
| Lincoln Township (Dallas County) | Dallas County | 5 | 143 |
| Lincoln Township (Emmet County) | Emmet County | 1 | 164 |
| Lincoln Township (Grundy County) | Grundy County | 4 | 178 |
| Lincoln Township (Hamilton County) | Hamilton County | 2 | 545 |
| Lincoln Township (Harrison County) | Harrison County | 2 | 160 |
| Lincoln Township (Iowa County) | Iowa County | 6 | 236 |
| Lincoln Township (Johnson County) | Johnson County | 3 | 182 |
| Lincoln Township (Kossuth County) | Kossuth County | 2 | 53 |
| Lincoln Township (Lucas County) | Lucas County | 1 | 324 |
| Lincoln Township (Madison County) | Madison County | 2 | 820 |
| Lincoln Township (Mahaska County) | Mahaska County | 1 | 222 |
| Lincoln Township (Monona County) | Monona County | 4 | 246 |
| Lincoln Township (Montgomery County) | Montgomery County | 3 | 91 |
| Lincoln Township (Obrien County) | Obrien County | 3 | 162 |
| Lincoln Township (Page County) | Page County | 3 | 251 |
| Lincoln Township (Plymouth County) | Plymouth County | 2 | 413 |
| Lincoln Township (Pocahontas County) | Pocahontas County | 2 | 109 |
| Lincoln Township (Polk County) | Polk County | 6 | 1,158 |
| Lincoln Township (Pottawattamie County) | Pottawattamie County | 3 | 223 |
| Lincoln Township (Poweshiek County) | Poweshiek County | 4 | 267 |
| Lincoln Township (Ringgold County) | Ringgold County | 2 | 208 |
| Lincoln Township (Scott County) | Scott County | 3 | 352 |
| Lincoln Township (Shelby County) | Shelby County | 2 | 598 |
| Lincoln Township (Sioux County) | Sioux County | 2 | 2,886 |
| Lincoln Township (Story County) | Story County | 3 | 749 |
| Lincoln Township (Tama County) | Tama County | 3 | 213 |
| Lincoln Township (Union County) | Union County | 2 | 362 |
| Lincoln Township (Warren County) | Warren County | 4 | 2,194 |
| Lincoln Township (Winnebago County) | Winnebago County | 2 | 326 |
| Lincoln Township (Winneshiek County) | Winneshiek County | 2 | 744 |
| Lincoln Township (Worth County) | Worth County | 2 | 1,703 |
| Lincoln Township (Wright County) | Wright County | 4 | 1,611 |
| Linden | Dallas County | 1 | 218 |
| Linden Township | Winnebago County | 2 | 91 |
| Lineville | Wayne County | 1 | 218 |
| Linn Grove | Buena Vista County | 1 | 145 |
| Linn Township (Cedar County) | Cedar County | 3 | 73 |
| Linn Township (Dallas County) | Dallas County | 3 | 570 |
| Linn Township (Linn County) | Linn County | 5 | 790 |
| Linn Township (Warren County) | Warren County | 3 | 10,367 |
| Linton Township | Allamakee County | 3 | 470 |
| Lisbon | Linn County | 1 | 1,923 |
| Liscomb | Marshall County | 1 | 244 |
| Liscomb Township | Marshall County | 4 | 298 |
| Liston Township | Woodbury County | 3 | 314 |
| Little Cedar | Mitchell County | 1 | 51 |
| Little Rock | Lyon County | 1 | 445 |
| Little Sioux | Harrison County | 1 | 196 |
| Little Sioux Township (Harrison County) | Harrison County | 5 | 286 |
| Little Sioux Township (Woodbury County) | Woodbury County | 4 | 318 |
| Livermore | Humboldt County | 1 | 421 |
| Lizard Township | Pocahontas County | 4 | 169 |
| Lloyd Township | Dickinson County | 1 | 696 |
| Lockridge | Jefferson County | 1 | 299 |
| Lockridge Township | Jefferson County | 4 | 875 |
| Locust Grove Township (Fremont County) | Fremont County | 4 | 158 |
| Locust Grove Township (Jefferson County) | Jefferson County | 3 | 777 |
| Lodomillo Township | Clayton County | 2 | 642 |
| Logan | Harrison County | 1 | 1,585 |
| Logan Township (Calhoun County) | Calhoun County | 2 | 41 |
| Logan Township (Clay County) | Clay County | 6 | 176 |
| Logan Township (Ida County) | Ida County | 2 | 256 |
| Logan Township (Lyon County) | Lyon County | 3 | 409 |
| Logan Township (Marshall County) | Marshall County | 4 | 1,254 |
| Logan Township (Sioux County) | Sioux County | 3 | 622 |
| Logan Township (Winnebago County) | Winnebago County | 2 | 180 |
| Lohrville | Calhoun County | 1 | 427 |
| Lone Rock | Kossuth County | 1 | 135 |
| Lone Tree | Johnson County | 1 | 1,391 |
| Lone Tree Township | Clay County | 3 | 837 |
| Long Creek Township | Decatur County | 2 | 150 |
| Long Grove | Scott County | 1 | 883 |
| Lorimor | Union County | 1 | 358 |
| Lost Grove Township | Webster County | 3 | 664 |
| Lost Island Township | Palo Alto County | 3 | 203 |
| Lost Nation | Clinton County | 1 | 471 |
| Lotts Creek Township (Kossuth County) | Kossuth County | 4 | 132 |
| Lotts Creek Township (Ringgold County) | Ringgold County | 1 | |
| Loveland | Pottawattamie County | 1 | 7 |
| Lovell Township | Jones County | 1 | 5,082 |
| Lovilia | Monroe County | 1 | 559 |
| Low Moor | Clinton County | 1 | 188 |
| Lowden | Cedar County | 1 | 703 |
| Lowell | Henry County | 1 | 131 |
| Lu Verne | Humboldt County | 1 | 248 |
| Lu Verne Township | Kossuth County | 2 | 315 |
| Luana | Clayton County | 1 | 236 |
| Lucas | Lucas County | 1 | 168 |
| Ludlow Township | Allamakee County | 2 | 589 |
| Luther | Boone County | 1 | 171 |
| Luxemburg | Dubuque County | 1 | 175 |
| Luzerne | Benton County | 1 | 113 |
| Lynn Grove Township | Jasper County | 4 | 1,944 |
| Lynn Township | Sioux County | 3 | 275 |
| Lynnville | Jasper County | 1 | 491 |
| Lyon Township (Hamilton County) | Hamilton County | 3 | 1,569 |
| Lyon Township (Lyon County) | Lyon County | 2 | 260 |
| Lyons Township | Mills County | 3 | 174 |
| Lytton | Sac County | 1 | 301 |
| Macedonia | Pottawattamie County | 1 | 259 |
| Macedonia Township | Pottawattamie County | 2 | 527 |
| Macksburg | Madison County | 1 | 167 |
| Madison Township (Buchanan County) | Buchanan County | 4 | 856 |
| Madison Township (Butler County) | Butler County | 4 | 208 |
| Madison Township (Clarke County) | Clarke County | 3 | 83 |
| Madison Township (Fremont County) | Fremont County | 2 | 133 |
| Madison Township (Hancock County) | Hancock County | 2 | 732 |
| Madison Township (Johnson County) | Johnson County | 4 | 3,550 |
| Madison Township (Jones County) | Jones County | 4 | 718 |
| Madison Township (Lee County) | Lee County | 2 | 9,948 |
| Madison Township (Madison County) | Madison County | 3 | 1,488 |
| Madison Township (Mahaska County) | Mahaska County | 3 | 430 |
| Madison Township (Polk County) | Polk County | 2 | 5,473 |
| Madison Township (Poweshiek County) | Poweshiek County | 3 | 475 |
| Madison Township (Winneshiek County) | Winneshiek County | 2 | 498 |
| Madrid | Boone County | 1 | 2,539 |
| Magnolia | Harrison County | 1 | 173 |
| Magnolia Township | Harrison County | 6 | 518 |
| Magor Township | Hancock County | 2 | 276 |
| Maharishi Vedic City | Jefferson County | 1 | 191 |
| Maine Township | Linn County | 4 | 1,654 |
| Makee Township | Allamakee County | 2 | 3,998 |
| Malaka Township | Jasper County | 4 | 413 |
| Malcom | Poweshiek County | 1 | 295 |
| Malcom Township | Poweshiek County | 2 | 591 |
| Mallard | Palo Alto County | 1 | 339 |
| Mallory Township | Clayton County | 3 | 344 |
| Maloy | Ringgold County | 1 | 25 |
| Malvern | Mills County | 1 | 1,047 |
| Manchester | Delaware County | 1 | 5,160 |
| Manilla | Crawford County | 1 | 1,055 |
| Manly | Worth County | 1 | 1,364 |
| Manning | Carroll County | 1 | 1,623 |
| Manson | Calhoun County | 1 | 1,781 |
| Mantua Township | Monroe County | 1 | 274 |
| Maple River Township | Carroll County | 1 | 415 |
| Maple Township (Ida County) | Ida County | 2 | 1,048 |
| Maple Township (Monona County) | Monona County | 3 | 734 |
| Maple Valley Township | Buena Vista County | 3 | 63 |
| Mapleton | Monona County | 1 | 1,418 |
| Maquoketa | Jackson County | 1 | 6,113 |
| Maquoketa Township | Jackson County | 3 | 2,852 |
| Marathon | Buena Vista County | 1 | 251 |
| Marble Rock | Floyd County | 1 | 280 |
| Marcus | Cherokee County | 1 | 1,148 |
| Marcus Township | Cherokee County | 2 | 506 |
| Marcy Township | Boone County | 4 | 1,330 |
| Marengo | Iowa County | 1 | 2,841 |
| Marengo Township | Iowa County | 3 | 2,687 |
| Marietta Township | Marshall County | 4 | 216 |
| Marion | Linn County | 1 | 34,750 |
| Marion Township (Clayton County) | Clayton County | 5 | 213 |
| Marion Township (Davis County) | Davis County | 3 | 412 |
| Marion Township (Franklin County) | Franklin County | 3 | 1,176 |
| Marion Township (Hamilton County) | Hamilton County | 3 | 1,025 |
| Marion Township (Henry County) | Henry County | 2 | 413 |
| Marion Township (Lee County) | Lee County | 4 | 332 |
| Marion Township (Linn County) | Linn County | 7 | 44,034 |
| Marion Township (Marshall County) | Marshall County | 3 | 857 |
| Marion Township (Plymouth County) | Plymouth County | 3 | 495 |
| Marion Township (Washington County) | Washington County | 4 | 508 |
| Mariposa Township | Jasper County | 4 | 206 |
| Marne | Cass County | 1 | 73 |
| Marquette | Clayton County | 1 | 391 |
| Marshall Township (Louisa County) | Louisa County | 4 | 154 |
| Marshall Township (Pocahontas County) | Pocahontas County | 3 | 136 |
| Marshall Township (Taylor County) | Taylor County | 3 | 190 |
| Marshalltown | Marshall County | 1 | 27,465 |
| Martelle | Jones County | 1 | 300 |
| Martensdale | Warren County | 1 | 493 |
| Martinsburg | Keokuk County | 1 | 166 |
| Marysville | Marion County | 1 | 28 |
| Mason City | Cerro Gordo County | 1 | 28,012 |
| Mason Township (Cerro Gordo County) | Cerro Gordo County | 1 | 439 |
| Mason Township (Taylor County) | Taylor County | 2 | 299 |
| Masonville | Delaware County | 1 | 139 |
| Massena | Cass County | 1 | 363 |
| Massena Township | Cass County | 1 | 622 |
| Massillon Township | Cedar County | 4 | 325 |
| Matlock | Sioux County | 1 | 65 |
| Maurice | Sioux County | 1 | 250 |
| Maxfield Township | Bremer County | 3 | 1,237 |
| Maxwell | Story County | 1 | 942 |
| Maynard | Fayette County | 1 | 522 |
| Maysville | Scott County | 1 | 246 |
| McCallsburg | Story County | 1 | 414 |
| McCausland | Scott County | 2 | 359 |
| McClelland | Pottawattamie County | 2 | 123 |
| McGregor | Clayton County | 2 | 916 |
| McIntire | Mitchell County | 1 | 75 |
| Meadow Township (Clay County) | Clay County | 2 | 230 |
| Meadow Township (Plymouth County) | Plymouth County | 2 | 300 |
| Mechanicsville | Cedar County | 1 | 1,149 |
| Mediapolis | Des Moines County | 1 | 1,481 |
| Melbourne | Marshall County | 1 | 846 |
| Melcher-Dallas | Marion County | 2 | 1,408 |
| Melrose | Monroe County | 1 | 112 |
| Melrose Township | Grundy County | 4 | 179 |
| Melville Township | Audubon County | 1 | 116 |
| Melvin | Osceola County | 1 | 210 |
| Mendon Township | Clayton County | 2 | 1,809 |
| Menlo | Guthrie County | 1 | 360 |
| Mercer Township | Adams County | 3 | 90 |
| Meriden | Cherokee County | 1 | 196 |
| Merrill | Plymouth County | 1 | 758 |
| Meservey | Cerro Gordo County | 1 | 290 |
| Meyer | Mitchell County | 1 | 10 |
| Middle Amana | Iowa County | 1 | 717 |
| Middle Fork Township | Ringgold County | 2 | 101 |
| Middlefield Township | Buchanan County | 2 | 220 |
| Middletown | Des Moines County | 1 | 257 |
| Midland Township | Lyon County | 2 | 90 |
| Miles | Jackson County | 1 | 391 |
| Milford | Dickinson County | 1 | 2,897 |
| Milford Township (Crawford County) | Crawford County | 4 | 420 |
| Milford Township (Dickinson County) | Dickinson County | 3 | 1,133 |
| Milford Township (Story County) | Story County | 3 | 622 |
| Military Township | Winneshiek County | 4 | 1,152 |
| Miller | Hancock County | 2 | 0 |
| Miller Township | Woodbury County | 3 | 187 |
| Millersburg | Iowa County | 1 | 160 |
| Millerton | Wayne County | 1 | 75 |
| Millville Township | Clayton County | 3 | 464 |
| Milo | Warren County | 1 | 820 |
| Milo Township | Delaware County | 4 | 1,295 |
| Milton | Van Buren County | 1 | 442 |
| Minburn | Dallas County | 1 | 314 |
| Minden | Pottawattamie County | 1 | 612 |
| Minden Township | Pottawattamie County | 4 | 1,211 |
| Mineola | Mills County | 1 | 198 |
| Minerva Township | Marshall County | 3 | 495 |
| Mingo | Jasper County | 1 | 277 |
| Missouri Valley | Harrison County | 1 | 2,822 |
| Mitchell | Mitchell County | 1 | 176 |
| Mitchell Township | Mitchell County | 2 | 203 |
| Mitchellville | Polk County | 1 | 2,525 |
| Modale | Harrison County | 1 | 284 |
| Mona | Mitchell County | 1 | 27 |
| Mondamin | Harrison County | 1 | 412 |
| Monmouth | Jackson County | 1 | 118 |
| Monmouth Township | Jackson County | 3 | 663 |
| Monona | Clayton County | 1 | 1,689 |
| Monona Township | Clayton County | 4 | 2,150 |
| Monroe | Jasper County | 1 | 1,755 |
| Monroe Township (Benton County) | Benton County | 3 | 149 |
| Monroe Township (Butler County) | Butler County | 2 | 1,448 |
| Monroe Township (Fremont County) | Fremont County | 3 | 227 |
| Monroe Township (Johnson County) | Johnson County | 4 | 479 |
| Monroe Township (Linn County) | Linn County | 7 | 13,673 |
| Monroe Township (Madison County) | Madison County | 3 | 265 |
| Monroe Township (Mahaska County) | Mahaska County | 3 | 224 |
| Monroe Township (Monroe County) | Monroe County | 2 | 304 |
| Monroe Township (Ringgold County) | Ringgold County | 2 | 69 |
| Monroe Township (Shelby County) | Shelby County | 3 | 161 |
| Monroe Township (Wayne County) | Wayne County | 1 | 173 |
| Montezuma | Poweshiek County | 1 | 1,619 |
| Monticello | Jones County | 1 | 3,792 |
| Montour | Tama County | 1 | 267 |
| Montpelier | Muscatine County | 1 | 157 |
| Montpelier Township | Muscatine County | 3 | 1,181 |
| Montrose | Lee County | 1 | 949 |
| Montrose Township | Lee County | 2 | 1,412 |
| Mooar | Lee County | 1 | 388 |
| Moorhead | Monona County | 1 | 216 |
| Moorland | Webster County | 1 | 142 |
| Moravia | Appanoose County | 1 | 819 |
| Morgan Township (Crawford County) | Crawford County | 2 | 226 |
| Morgan Township (Decatur County) | Decatur County | 2 | 53 |
| Morgan Township (Franklin County) | Franklin County | 3 | 148 |
| Morgan Township (Harrison County) | Harrison County | 2 | 515 |
| Morgan Township (Woodbury County) | Woodbury County | 3 | 214 |
| Morley | Jones County | 1 | 114 |
| Morning Sun | Louisa County | 1 | 1,083 |
| Morning Sun Township | Louisa County | 4 | 1,274 |
| Morrison | Grundy County | 1 | 77 |
| Morton Township | Page County | 2 | 166 |
| Mosalem Township | Dubuque County | 3 | 1,885 |
| Moscow | Muscatine County | 1 | 235 |
| Moscow Township | Muscatine County | 4 | 541 |
| Mott Township | Franklin County | 1 | 273 |
| Moulton | Appanoose County | 1 | 668 |
| Mound Prairie Township | Jasper County | 4 | 796 |
| Mount Auburn | Benton County | 1 | 125 |
| Mount Ayr | Ringgold County | 1 | 1,604 |
| Mount Pleasant | Henry County | 1 | 8,737 |
| Mount Sterling | Van Buren County | 1 | 21 |
| Mount Union | Henry County | 1 | 99 |
| Mount Valley Township | Winnebago County | 4 | 657 |
| Mount Vernon | Linn County | 1 | 4,498 |
| Mount Vernon Township (Black Hawk County) | Black Hawk County | 3 | 1,275 |
| Mount Vernon Township (Cerro Gordo County) | Cerro Gordo County | 4 | 332 |
| Moville | Woodbury County | 1 | 1,679 |
| Moville Township | Woodbury County | 3 | 481 |
| Murray | Clarke County | 1 | 640 |
| Muscatine | Muscatine County | 1 | 22,915 |
| Mystic | Appanoose County | 1 | 428 |
| Nashua | Chickasaw County | 1 | 1,767 |
| Nassau Township | Sioux County | 2 | 2,266 |
| Nebraska Township | Page County | 2 | 73 |
| Nemaha | Sac County | 1 | 74 |
| Neola | Pottawattamie County | 1 | 870 |
| Neola Township | Pottawattamie County | 2 | 1,287 |
| Nevada | Story County | 1 | 6,795 |
| Nevada Township (Palo Alto County) | Palo Alto County | 4 | 51 |
| Nevada Township (Story County) | Story County | 2 | 7,111 |
| New Albany Township | Story County | 3 | 1,081 |
| New Albin | Allamakee County | 1 | 618 |
| New Buda Township | Decatur County | 2 | 387 |
| New Hampton | Chickasaw County | 1 | 3,565 |
| New Hampton Township | Chickasaw County | 2 | 2,994 |
| New Hartford | Butler County | 1 | 685 |
| New Haven | Mitchell County | 1 | 65 |
| New Hope Township | Union County | 1 | 710 |
| New Liberty | Scott County | 1 | 76 |
| New London | Henry County | 1 | 1,838 |
| New London Township | Henry County | 2 | 2,941 |
| New Market | Taylor County | 1 | 454 |
| New Oregon Township | Howard County | 5 | 657 |
| New Providence | Hardin County | 1 | 278 |
| New Sharon | Mahaska County | 1 | 1,387 |
| New Vienna | Dubuque County | 1 | 385 |
| New Virginia | Warren County | 1 | 594 |
| New Wine Township | Dubuque County | 3 | 4,701 |
| Newark Township | Webster County | 5 | 262 |
| Newburg Township | Mitchell County | 3 | 481 |
| Newell | Buena Vista County | 1 | 985 |
| Newell Township | Buena Vista County | 2 | 1,211 |
| Newhall | Benton County | 1 | 753 |
| Newport Township | Johnson County | 4 | 2,062 |
| Newton | Jasper County | 1 | 15,234 |
| Newton Township (Buchanan County) | Buchanan County | 4 | 231 |
| Newton Township (Carroll County) | Carroll County | 3 | 349 |
| Newton Township (Jasper County) | Jasper County | 1 | 15,811 |
| Newton Township (Winnebago County) | Winnebago County | 2 | 150 |
| Nichols | Muscatine County | 1 | 489 |
| Niles Township | Floyd County | 3 | 370 |
| Nishnabotny Township | Crawford County | 2 | 1,139 |
| Noble Township | Cass County | 3 | 95 |
| Nodaway | Adams County | 1 | 118 |
| Nodaway Township (Adams County) | Adams County | 2 | 133 |
| Nodaway Township (Page County) | Page County | 2 | 6,038 |
| Nodaway Township (Taylor County) | Taylor County | 5 | 78 |
| Nokomis Township | Buena Vista County | 2 | 2,556 |
| Nora Springs | Floyd County | 1 | 1,439 |
| North Buena Vista | Clayton County | 1 | 124 |
| North English | Iowa County | 1 | 941 |
| North Fork Township | Delaware County | 5 | 534 |
| North Liberty | Johnson County | 1 | 13,330 |
| North Washington | Chickasaw County | 2 | 130 |
| Northboro | Page County | 1 | 36 |
| Northwood | Worth County | 1 | 2,036 |
| Norwalk | Warren County | 1 | 9,012 |
| Norwalk Township | Pottawattamie County | 4 | 1,416 |
| Norway | Benton County | 1 | 679 |
| Norway Township (Humboldt County) | Humboldt County | 3 | 383 |
| Norway Township (Winnebago County) | Winnebago County | 3 | 317 |
| Norway Township (Wright County) | Wright County | 3 | 216 |
| Numa | Appanoose County | 1 | 74 |
| Oak Dale Township | Howard County | 2 | 178 |
| Oak Hills | Des Moines County | 1 | 129 |
| Oak Township | Mills County | 5 | 2,279 |
| Oakfield Township | Audubon County | 4 | 298 |
| Oakland | Pottawattamie County | 1 | 1,592 |
| Oakland Acres | Jasper County | 1 | 153 |
| Oakland Township (Franklin County) | Franklin County | 3 | 247 |
| Oakland Township (Louisa County) | Louisa County | 3 | 524 |
| Oakville | Louisa County | 1 | 122 |
| Ocheyedan | Osceola County | 1 | 460 |
| Ocheyedan Township | Osceola County | 2 | 736 |
| Odebolt | Sac County | 1 | 1,230 |
| Oelwein | Fayette County | 1 | 6,408 |
| Ogden | Boone County | 1 | 2,189 |
| Ohio Township | Madison County | 4 | 1,073 |
| Okoboji | Dickinson County | 1 | 660 |
| Okoboji Township | Dickinson County | 1 | 2,219 |
| Olds | Henry County | 1 | 226 |
| Olin | Jones County | 1 | 707 |
| Olive Township | Clinton County | 3 | 811 |
| Ollie | Keokuk County | 1 | 274 |
| Omega Township | Obrien County | 1 | 123 |
| Onawa | Monona County | 1 | 2,985 |
| Oneida Township (Delaware County) | Delaware County | 5 | 1,656 |
| Oneida Township (Tama County) | Tama County | 3 | 632 |
| Onslow | Jones County | 1 | 207 |
| Oran | Fayette County | 1 | |
| Oran Township | Fayette County | 3 | 968 |
| Orange City | Sioux County | 1 | 6,054 |
| Orange Township (Black Hawk County) | Black Hawk County | 1 | 561 |
| Orange Township (Clinton County) | Clinton County | 5 | 982 |
| Orange Township (Guthrie County) | Guthrie County | 1 | 99 |
| Orchard | Mitchell County | 1 | 53 |
| Oregon Township | Washington County | 1 | 1,259 |
| Orient | Adair County | 1 | 365 |
| Orient Township | Adair County | 3 | 635 |
| Orleans | Dickinson County | 1 | 759 |
| Orleans Township | Winneshiek County | 2 | 369 |
| Orono Township | Muscatine County | 3 | 600 |
| Orthel Township | Hancock County | 2 | 306 |
| Osage | Mitchell County | 1 | 3,615 |
| Osage Township | Mitchell County | 1 | 3,816 |
| Osceola | Clarke County | 1 | 4,948 |
| Osceola Township (Clarke County) | Clarke County | 1 | 502 |
| Osceola Township (Franklin County) | Franklin County | 2 | 259 |
| Oskaloosa | Mahaska County | 1 | 11,494 |
| Ossian | Winneshiek County | 1 | 902 |
| Osterdock | Clayton County | 2 | 67 |
| Otho | Webster County | 1 | 526 |
| Otho Township | Webster County | 3 | 756 |
| Otley | Marion County | 1 | |
| Oto | Woodbury County | 1 | 112 |
| Oto Township | Woodbury County | 5 | 456 |
| Otranto | Mitchell County | 1 | 23 |
| Otranto Township | Mitchell County | 1 | 261 |
| Otter Creek Township (Crawford County) | Crawford County | 4 | 1,399 |
| Otter Creek Township (Jackson County) | Jackson County | 3 | 592 |
| Otter Creek Township (Linn County) | Linn County | 5 | 1,402 |
| Otter Creek Township (Lucas County) | Lucas County | 3 | 239 |
| Otter Creek Township (Tama County) | Tama County | 3 | 135 |
| Otter Township | Warren County | 3 | 962 |
| Ottosen | Humboldt County | 1 | 35 |
| Ottumwa | Wapello County | 1 | 24,849 |
| Owasa | Hardin County | 1 | 15 |
| Owen Township | Cerro Gordo County | 3 | 187 |
| Oxford | Johnson County | 1 | 799 |
| Oxford Junction | Jones County | 1 | 593 |
| Oxford Township (Johnson County) | Johnson County | 3 | 1,446 |
| Oxford Township (Jones County) | Jones County | 3 | 822 |
| Oyens | Plymouth County | 1 | 70 |
| Pacific Junction | Mills County | 1 | 403 |
| Packwood | Jefferson County | 1 | 272 |
| Paint Creek Township | Allamakee County | 4 | 398 |
| Palermo Township | Grundy County | 4 | 3,085 |
| Palestine Township | Story County | 6 | 6,671 |
| Palmer | Pocahontas County | 1 | 125 |
| Palmyra Township | Warren County | 2 | 1,022 |
| Palo | Linn County | 1 | 911 |
| Palo Alto Township | Jasper County | 3 | 3,550 |
| Panama | Shelby County | 1 | 212 |
| Panora | Guthrie County | 1 | 1,215 |
| Panorama Park | Scott County | 1 | 153 |
| Paradise Township | Crawford County | 4 | 131 |
| Paris Township | Howard County | 5 | 348 |
| Park View | Scott County | 2 | 2,408 |
| Parkersburg | Butler County | 1 | 1,914 |
| Parnell | Iowa County | 1 | 164 |
| Paton | Greene County | 1 | 262 |
| Paton Township | Greene County | 3 | 314 |
| Patterson | Madison County | 1 | 84 |
| Paullina | Obrien County | 1 | 1,025 |
| Pella | Marion County | 1 | 10,365 |
| Penn Township (Guthrie County) | Guthrie County | 4 | 388 |
| Penn Township (Jefferson County) | Jefferson County | 3 | 333 |
| Penn Township (Johnson County) | Johnson County | 5 | 32,137 |
| Penn Township (Madison County) | Madison County | 2 | 583 |
| Peoples Township | Boone County | 3 | 429 |
| Peosta | Dubuque County | 1 | 1,506 |
| Percival | Fremont County | 1 | 21 |
| Perry | Dallas County | 1 | 7,828 |
| Perry Township (Buchanan County) | Buchanan County | 3 | 3,085 |
| Perry Township (Davis County) | Davis County | 1 | 322 |
| Perry Township (Jackson County) | Jackson County | 5 | 789 |
| Perry Township (Plymouth County) | Plymouth County | 3 | 709 |
| Perry Township (Tama County) | Tama County | 2 | 1,924 |
| Persia | Harrison County | 1 | 218 |
| Peru | Dubuque County | 1 | |
| Peru Township | Dubuque County | 4 | 1,644 |
| Peterson | Clay County | 1 | 321 |
| Peterson Township | Clay County | 2 | 475 |
| Pierce Township | Page County | 2 | 1,015 |
| Pierson | Woodbury County | 1 | 436 |
| Pike Township | Muscatine County | 3 | 756 |
| Pilot Grove | Montgomery County | 1 | |
| Pilot Grove Township | Montgomery County | 3 | 41 |
| Pilot Mound | Boone County | 1 | 126 |
| Pilot Mound Township | Boone County | 4 | 252 |
| Pilot Township (Cherokee County) | Cherokee County | 2 | 215 |
| Pilot Township (Iowa County) | Iowa County | 4 | 512 |
| Pioneer | Humboldt County | 1 | 30 |
| Pioneer Township | Cedar County | 2 | 1,324 |
| Pisgah | Harrison County | 1 | 237 |
| Pitcher Township | Cherokee County | 2 | 1,066 |
| Pittsford Township | Butler County | 5 | 883 |
| Plainfield | Bremer County | 1 | 487 |
| Plainview | Scott County | 1 | 11 |
| Plank Township | Keokuk County | 5 | 444 |
| Plano | Appanoose County | 1 | 76 |
| Plato Township | Sioux County | 3 | 267 |
| Platte Township (Taylor County) | Taylor County | 2 | 1,552 |
| Platte Township (Union County) | Union County | 3 | 150 |
| Plattville Township | Mills County | 5 | 830 |
| Pleasant Grove Township (Des Moines County) | Des Moines County | 4 | 637 |
| Pleasant Grove Township (Floyd County) | Floyd County | 2 | 218 |
| Pleasant Grove Township (Mahaska County) | Mahaska County | 4 | 404 |
| Pleasant Grove Township (Marion County) | Marion County | 3 | 2,795 |
| Pleasant Hill | Polk County | 1 | 8,678 |
| Pleasant Plain | Jefferson County | 1 | 59 |
| Pleasant Ridge Township | Lee County | 4 | 390 |
| Pleasant Township (Appanoose County) | Appanoose County | 3 | 712 |
| Pleasant Township (Cass County) | Cass County | 1 | 1,186 |
| Pleasant Township (Hardin County) | Hardin County | 3 | 197 |
| Pleasant Township (Lucas County) | Lucas County | 2 | 189 |
| Pleasant Township (Monroe County) | Monroe County | 2 | 143 |
| Pleasant Township (Pottawattamie County) | Pottawattamie County | 3 | 240 |
| Pleasant Township (Poweshiek County) | Poweshiek County | 3 | 237 |
| Pleasant Township (Union County) | Union County | 4 | 60 |
| Pleasant Township (Wapello County) | Wapello County | 3 | 33 |
| Pleasant Township (Winneshiek County) | Winneshiek County | 1 | 353 |
| Pleasant Township (Wright County) | Wright County | 2 | 2,385 |
| Pleasant Valley Township (Carroll County) | Carroll County | 2 | 428 |
| Pleasant Valley Township (Cerro Gordo County) | Cerro Gordo County | 4 | 409 |
| Pleasant Valley Township (Fayette County) | Fayette County | 3 | 995 |
| Pleasant Valley Township (Grundy County) | Grundy County | 4 | 286 |
| Pleasant Valley Township (Johnson County) | Johnson County | 4 | 266 |
| Pleasant Valley Township (Scott County) | Scott County | 5 | 40,356 |
| Pleasant Valley Township (Webster County) | Webster County | 2 | 742 |
| Pleasanton | Decatur County | 1 | 47 |
| Pleasantville | Marion County | 1 | 1,591 |
| Plover | Pocahontas County | 1 | 81 |
| Plum Creek Township | Kossuth County | 2 | 372 |
| Plymouth | Cerro Gordo County | 1 | 381 |
| Plymouth Township | Plymouth County | 2 | 1,297 |
| Pocahontas | Pocahontas County | 1 | 1,755 |
| Poe Township | Ringgold County | 1 | 78 |
| Poland Township | Buena Vista County | 4 | 320 |
| Polk City | Polk County | 1 | 3,451 |
| Polk Township (Benton County) | Benton County | 5 | 2,092 |
| Polk Township (Bremer County) | Bremer County | 3 | 861 |
| Polk Township (Jefferson County) | Jefferson County | 5 | 778 |
| Polk Township (Shelby County) | Shelby County | 4 | 251 |
| Polk Township (Taylor County) | Taylor County | 2 | 80 |
| Polk Township (Wapello County) | Wapello County | 2 | 636 |
| Pomeroy | Calhoun County | 1 | 774 |
| Popejoy | Franklin County | 1 | 70 |
| Port Louisa Township | Louisa County | 2 | 727 |
| Portland | Cerro Gordo County | 1 | 15 |
| Portland Township (Cerro Gordo County) | Cerro Gordo County | 3 | 356 |
| Portland Township (Kossuth County) | Kossuth County | 2 | 284 |
| Portland Township (Plymouth County) | Plymouth County | 2 | 1,674 |
| Portsmouth | Shelby County | 1 | 232 |
| Post Township | Allamakee County | 1 | 2,651 |
| Postville | Allamakee County | 1 | 2,174 |
| Poweshiek Township | Jasper County | 3 | 1,267 |
| Powhatan Township | Pocahontas County | 3 | 163 |
| Poyner Township | Black Hawk County | 9 | 3,033 |
| Prairie City | Jasper County | 1 | 1,502 |
| Prairie Creek Township | Dubuque County | 4 | 827 |
| Prairie Springs Township | Jackson County | 2 | 657 |
| Prairie Township (Davis County) | Davis County | 3 | 453 |
| Prairie Township (Delaware County) | Delaware County | 3 | 328 |
| Prairie Township (Fremont County) | Fremont County | 3 | 53 |
| Prairie Township (Keokuk County) | Keokuk County | 4 | 219 |
| Prairie Township (Kossuth County) | Kossuth County | 4 | 114 |
| Prairie Township (Mahaska County) | Mahaska County | 1 | 1,713 |
| Prairieburg | Linn County | 1 | 186 |
| Prescott | Adams County | 1 | 292 |
| Prescott Township | Adams County | 2 | 507 |
| Preston | Jackson County | 1 | 959 |
| Preston Township | Plymouth County | 3 | 387 |
| Primghar | Obrien County | 1 | 972 |
| Princeton | Scott County | 1 | 870 |
| Princeton Township | Scott County | 5 | 1,382 |
| Prole | Warren County | 1 | |
| Promise City | Wayne County | 1 | 163 |
| Protivin | Howard County | 1 | 309 |
| Providence Township (Buena Vista County) | Buena Vista County | 2 | 125 |
| Providence Township (Hardin County) | Hardin County | 3 | 343 |
| Prussia Township | Adair County | 3 | 122 |
| Pulaski | Davis County | 1 | 332 |
| Putnam Township (Fayette County) | Fayette County | 4 | 313 |
| Putnam Township (Linn County) | Linn County | 4 | 2,896 |
| Pymosa Township | Cass County | 2 | 547 |
| Quasqueton | Buchanan County | 1 | 479 |
| Quimby | Cherokee County | 1 | 284 |
| Quincy Township | Adams County | 1 | 1,636 |
| Radcliffe | Hardin County | 1 | 571 |
| Raglan Township | Harrison County | 2 | 256 |
| Rake | Winnebago County | 1 | 119 |
| Ralston | Carroll County | 1 | 135 |
| Ramsey Township | Kossuth County | 3 | 146 |
| Randalia | Fayette County | 1 | 25 |
| Randall | Hamilton County | 1 | 144 |
| Randolph | Fremont County | 1 | 222 |
| Rathbun | Appanoose County | 1 | 80 |
| Rawles Township | Mills County | 3 | 580 |
| Raymond | Black Hawk County | 1 | 818 |
| Read Township | Clayton County | 3 | 682 |
| Reading Township (Calhoun County) | Calhoun County | 2 | 601 |
| Reading Township (Sioux County) | Sioux County | 2 | 597 |
| Readlyn | Bremer County | 1 | 906 |
| Reasnor | Jasper County | 1 | 135 |
| Red Oak | Montgomery County | 1 | 5,710 |
| Red Oak Township (Cedar County) | Cedar County | 3 | 242 |
| Red Oak Township (Montgomery County) | Montgomery County | 1 | 5,903 |
| Red Rock Township | Marion County | 6 | 448 |
| Redding | Ringgold County | 1 | 132 |
| Redfield | Dallas County | 1 | 849 |
| Reeve Township | Franklin County | 2 | 183 |
| Reinbeck | Grundy County | 1 | 1,770 |
| Rembrandt | Buena Vista County | 1 | 161 |
| Remsen | Plymouth County | 1 | 1,856 |
| Remsen Township | Plymouth County | 1 | 1,982 |
| Renwick | Humboldt County | 1 | 246 |
| Rhodes | Marshall County | 1 | 282 |
| Rice Township | Ringgold County | 2 | 339 |
| Riceville | Howard County | 1 | 844 |
| Richland | Keokuk County | 1 | 716 |
| Richland Township (Adair County) | Adair County | 4 | 100 |
| Richland Township (Carroll County) | Carroll County | 3 | 134 |
| Richland Township (Chickasaw County) | Chickasaw County | 3 | 353 |
| Richland Township (Decatur County) | Decatur County | 1 | 308 |
| Richland Township (Delaware County) | Delaware County | 3 | 592 |
| Richland Township (Dickinson County) | Dickinson County | 4 | 178 |
| Richland Township (Franklin County) | Franklin County | 3 | 137 |
| Richland Township (Guthrie County) | Guthrie County | 3 | 466 |
| Richland Township (Jackson County) | Jackson County | 3 | 387 |
| Richland Township (Jasper County) | Jasper County | 4 | 179 |
| Richland Township (Jones County) | Jones County | 2 | 734 |
| Richland Township (Keokuk County) | Keokuk County | 3 | 715 |
| Richland Township (Lyon County) | Lyon County | 3 | 1,122 |
| Richland Township (Mahaska County) | Mahaska County | 3 | 353 |
| Richland Township (Sac County) | Sac County | 2 | 1,050 |
| Richland Township (Story County) | Story County | 2 | 305 |
| Richland Township (Tama County) | Tama County | 2 | 77 |
| Richland Township (Wapello County) | Wapello County | 3 | 682 |
| Richland Township (Warren County) | Warren County | 4 | 1,037 |
| Richman Township | Wayne County | 1 | 648 |
| Rickardsville | Dubuque County | 3 | 205 |
| Ricketts | Crawford County | 1 | 152 |
| Ridgeway | Winneshiek County | 1 | 380 |
| Riley Township | Ringgold County | 1 | 32 |
| Rinard | Calhoun County | 2 | 57 |
| Ringsted | Emmet County | 1 | 484 |
| Ripley Township | Butler County | 3 | 147 |
| Rippey | Greene County | 1 | 255 |
| River Sioux | Harrison County | 1 | 54 |
| Riverdale | Scott County | 1 | 593 |
| Riverdale Township | Kossuth County | 5 | 232 |
| Riverside | Washington County | 1 | 1,020 |
| Riverside Township (Fremont County) | Fremont County | 3 | 312 |
| Riverside Township (Lyon County) | Lyon County | 1 | 361 |
| Riverton | Fremont County | 1 | 367 |
| Riverton Township (Clay County) | Clay County | 2 | 237 |
| Riverton Township (Floyd County) | Floyd County | 3 | 441 |
| Riverton Township (Fremont County) | Fremont County | 3 | 278 |
| Robins | Linn County | 1 | 3,136 |
| Rochester | Cedar County | 1 | 236 |
| Rochester Township | Cedar County | 3 | 720 |
| Rock Creek Township | Jasper County | 2 | 1,158 |
| Rock Falls | Cerro Gordo County | 1 | 130 |
| Rock Grove Township | Floyd County | 2 | 1,798 |
| Rock Rapids | Lyon County | 1 | 2,552 |
| Rock Township (Cherokee County) | Cherokee County | 3 | 142 |
| Rock Township (Lyon County) | Lyon County | 1 | 2,919 |
| Rock Township (Mitchell County) | Mitchell County | 3 | 296 |
| Rock Township (Sioux County) | Sioux County | 3 | 4,573 |
| Rock Township (Woodbury County) | Woodbury County | 3 | 860 |
| Rock Valley | Sioux County | 1 | 3,369 |
| Rockford | Floyd County | 1 | 925 |
| Rockford Township (Floyd County) | Floyd County | 2 | 1,263 |
| Rockford Township (Pottawattamie County) | Pottawattamie County | 4 | 508 |
| Rockwell | Cerro Gordo County | 1 | 974 |
| Rockwell City | Calhoun County | 1 | 2,237 |
| Rodman | Palo Alto County | 1 | 28 |
| Rodney | Monona County | 1 | 85 |
| Roland | Story County | 1 | 1,363 |
| Roland Township | Webster County | 3 | 615 |
| Rolfe | Pocahontas County | 1 | 572 |
| Rome | Henry County | 1 | 99 |
| Rome Township | Jones County | 4 | 1,209 |
| Roosevelt Township | Pocahontas County | 3 | 130 |
| Roscoe Township | Davis County | 3 | 465 |
| Rose Grove Township | Hamilton County | 4 | 170 |
| Rose Hill | Mahaska County | 1 | 143 |
| Roselle Township | Carroll County | 2 | 747 |
| Roseville | Floyd County | 3 | 47 |
| Ross Township (Franklin County) | Franklin County | 3 | 291 |
| Ross Township (Taylor County) | Taylor County | 1 | 167 |
| Rossie | Clay County | 1 | 76 |
| Round Prairie Township | Jefferson County | 4 | 228 |
| Rowan | Wright County | 1 | 150 |
| Rowley | Buchanan County | 1 | 289 |
| Royal | Clay County | 1 | 599 |
| Rudd | Floyd County | 1 | 445 |
| Rudd Township | Floyd County | 3 | 701 |
| Runnells | Polk County | 1 | 541 |
| Rush Lake Township | Palo Alto County | 3 | 344 |
| Russell | Lucas County | 1 | 504 |
| Ruthven | Palo Alto County | 1 | 721 |
| Rutland | Humboldt County | 1 | 91 |
| Rutland Township (Humboldt County) | Humboldt County | 3 | 268 |
| Rutland Township (Woodbury County) | Woodbury County | 4 | 598 |
| Ryan | Delaware County | 1 | 404 |
| Sabula | Jackson County | 1 | 536 |
| Sac City | Sac County | 1 | 2,196 |
| Sac Township | Sac County | 3 | 409 |
| Sageville | Dubuque County | 2 | 137 |
| Saint Anthony | Marshall County | 1 | |
| Saint Donatus | Jackson County | 1 | |
| Saint Lucas | Fayette County | 1 | |
| Saint Marys | Warren County | 1 | |
| Saint Olaf | Clayton County | 1 | |
| Saint Paul | Lee County | 1 | |
| Salem | Henry County | 1 | 402 |
| Salem Township | Henry County | 3 | 804 |
| Salix | Woodbury County | 1 | 303 |
| Salt Creek Township (Davis County) | Davis County | 4 | 75 |
| Salt Creek Township (Tama County) | Tama County | 3 | 692 |
| Sanborn | Obrien County | 1 | 1,178 |
| Sand Creek Township | Union County | 2 | 179 |
| Sandusky | Lee County | 1 | 312 |
| Sandyville | Warren County | 1 | 76 |
| Saratoga Township | Howard County | 3 | 276 |
| Saylor Township | Polk County | 5 | 6,959 |
| Saylorville | Polk County | 3 | 2,849 |
| Saylorville Reservoir | Polk County | 7 | |
| Scarville | Winnebago County | 1 | 103 |
| Schaller | Sac County | 1 | 776 |
| Schleswig | Crawford County | 1 | 784 |
| Scotch Grove Township | Jones County | 4 | 257 |
| Scott Township (Buena Vista County) | Buena Vista County | 3 | 191 |
| Scott Township (Fayette County) | Fayette County | 5 | 187 |
| Scott Township (Floyd County) | Floyd County | 4 | 42 |
| Scott Township (Franklin County) | Franklin County | 2 | 394 |
| Scott Township (Fremont County) | Fremont County | 3 | 328 |
| Scott Township (Hamilton County) | Hamilton County | 3 | 179 |
| Scott Township (Henry County) | Henry County | 2 | 1,236 |
| Scott Township (Johnson County) | Johnson County | 4 | 1,945 |
| Scott Township (Madison County) | Madison County | 3 | 944 |
| Scott Township (Mahaska County) | Mahaska County | 3 | 459 |
| Scott Township (Montgomery County) | Montgomery County | 2 | 870 |
| Scott Township (Poweshiek County) | Poweshiek County | 3 | 142 |
| Scranton | Greene County | 1 | 496 |
| Scranton Township | Greene County | 1 | 709 |
| Searsboro | Poweshiek County | 1 | 154 |
| Seely Township | Guthrie County | 2 | 109 |
| Selma | Van Buren County | 1 | |
| Seneca Township | Kossuth County | 6 | 152 |
| Sergeant Bluff | Woodbury County | 1 | 4,178 |
| Settlers Township | Sioux County | 4 | 271 |
| Seventy-Six Township (Muscatine County) | Muscatine County | 2 | 296 |
| Seventy-Six Township (Washington County) | Washington County | 3 | 239 |
| Sexton | Kossuth County | 2 | 113 |
| Seymour | Wayne County | 1 | 914 |
| Shambaugh | Page County | 1 | 152 |
| Shannon City | Union County | 1 | 65 |
| Sharon Township (Appanoose County) | Appanoose County | 3 | 197 |
| Sharon Township (Audubon County) | Audubon County | 4 | 563 |
| Sharon Township (Clinton County) | Clinton County | 4 | 965 |
| Sharon Township (Johnson County) | Johnson County | 3 | 1,311 |
| Sharpsburg | Taylor County | 1 | 93 |
| Sheffield | Franklin County | 1 | 1,004 |
| Shelby | Shelby County | 1 | 583 |
| Shelby Township | Shelby County | 3 | 835 |
| Sheldahl | Boone County | 1 | 270 |
| Sheldon | Obrien County | 1 | 5,096 |
| Shell Rock | Butler County | 1 | 1,237 |
| Shell Rock Township | Butler County | 5 | 1,983 |
| Shellsburg | Benton County | 1 | 982 |
| Shenandoah | Page County | 1 | 5,144 |
| Sheridan Township (Carroll County) | Carroll County | 4 | 352 |
| Sheridan Township (Cherokee County) | Cherokee County | 4 | 574 |
| Sheridan Township (Poweshiek County) | Poweshiek County | 3 | 124 |
| Sheridan Township (Scott County) | Scott County | 5 | 6,981 |
| Sheridan Township (Sioux County) | Sioux County | 2 | 1,177 |
| Sherman Township (Calhoun County) | Calhoun County | 4 | 641 |
| Sherman Township (Hardin County) | Hardin County | 2 | 816 |
| Sherman Township (Jasper County) | Jasper County | 4 | 424 |
| Sherman Township (Kossuth County) | Kossuth County | 2 | 179 |
| Sherman Township (Monona County) | Monona County | 3 | 374 |
| Sherman Township (Montgomery County) | Montgomery County | 3 | 760 |
| Sherman Township (Pocahontas County) | Pocahontas County | 3 | 233 |
| Sherman Township (Sioux County) | Sioux County | 2 | 591 |
| Sherman Township (Story County) | Story County | 4 | 121 |
| Sherrill | Dubuque County | 1 | 181 |
| Shiloh Township | Grundy County | 2 | 1,027 |
| Shueyville | Johnson County | 2 | 520 |
| Sibley | Osceola County | 1 | 2,761 |
| Sidney | Fremont County | 1 | 1,048 |
| Sidney Township | Fremont County | 4 | 1,507 |
| Sigourney | Keokuk County | 1 | 2,136 |
| Sigourney Township | Keokuk County | 1 | 1,999 |
| Silver City | Mills County | 1 | 191 |
| Silver Creek Township (Ida County) | Ida County | 4 | 18 |
| Silver Creek Township (Mills County) | Mills County | 1 | 119 |
| Silver Creek Township (Pottawattamie County) | Pottawattamie County | 4 | 902 |
| Silver Lake Township (Dickinson County) | Dickinson County | 1 | 1,285 |
| Silver Lake Township (Palo Alto County) | Palo Alto County | 3 | 203 |
| Silver Lake Township (Worth County) | Worth County | 2 | 362 |
| Silver Township | Cherokee County | 5 | 168 |
| Sioux Center | Sioux County | 1 | 7,055 |
| Sioux City | Woodbury County | 8 | 82,529 |
| Sioux Rapids | Buena Vista County | 1 | 654 |
| Sioux Township (Clay County) | Clay County | 2 | 327 |
| Sioux Township (Lyon County) | Lyon County | 3 | 419 |
| Sioux Township (Monona County) | Monona County | 4 | 60 |
| Sioux Township (Plymouth County) | Plymouth County | 2 | 238 |
| Sioux Township (Sioux County) | Sioux County | 2 | 118 |
| Slater | Story County | 1 | 1,610 |
| Sloan | Woodbury County | 1 | 1,024 |
| Sloan Township | Woodbury County | 2 | 1,252 |
| Smithfield Township | Fayette County | 3 | 206 |
| Smithland | Woodbury County | 1 | 183 |
| Soap Creek Township | Davis County | 2 | 601 |
| Soldier | Monona County | 1 | 194 |
| Soldier Township (Crawford County) | Crawford County | 6 | 154 |
| Soldier Township (Monona County) | Monona County | 2 | 256 |
| Solon | Johnson County | 1 | 2,232 |
| Somers | Calhoun County | 1 | 130 |
| South Amana | Iowa County | 1 | 160 |
| South English | Keokuk County | 1 | 212 |
| South Fork Township (Delaware County) | Delaware County | 3 | 885 |
| South Fork Township (Jackson County) | Jackson County | 1 | 4,426 |
| South Fork Township (Wayne County) | Wayne County | 4 | 421 |
| South Township | Madison County | 4 | 1,489 |
| Spaulding Township | Union County | 1 | 143 |
| Spencer | Clay County | 1 | 11,204 |
| Sperry | Des Moines County | 1 | 225 |
| Sperry Township | Clayton County | 5 | 380 |
| Spillville | Winneshiek County | 1 | 284 |
| Spirit Lake | Dickinson County | 1 | 4,830 |
| Spirit Lake Township | Dickinson County | 1 | 1,060 |
| Spragueville | Jackson County | 1 | 70 |
| Spring Creek Township (Black Hawk County) | Black Hawk County | 2 | 322 |
| Spring Creek Township (Mahaska County) | Mahaska County | 3 | 1,512 |
| Spring Creek Township (Tama County) | Tama County | 2 | 1,200 |
| Spring Grove Township | Linn County | 5 | 692 |
| Spring Hill | Warren County | 1 | 61 |
| Spring Rock Township | Clinton County | 2 | 1,267 |
| Spring Township | Cherokee County | 5 | 319 |
| Spring Valley Township (Dallas County) | Dallas County | 2 | 8,497 |
| Spring Valley Township (Monona County) | Monona County | 2 | 442 |
| Springbrook | Jackson County | 2 | 163 |
| Springdale Township | Cedar County | 2 | 2,991 |
| Springfield Township (Cedar County) | Cedar County | 4 | 1,141 |
| Springfield Township (Kossuth County) | Kossuth County | 3 | 34 |
| Springfield Township (Winneshiek County) | Winneshiek County | 3 | 305 |
| Springville | Linn County | 1 | 1,034 |
| Squaw Township | Warren County | 3 | 550 |
| St. Ansgar | Mitchell County | 1 | 1,187 |
| St. Ansgar Township | Mitchell County | 2 | 1,482 |
| St. Anthony | Marshall County | 2 | 111 |
| St. Benedict | Kossuth County | 2 | 27 |
| St. Charles | Madison County | 1 | 674 |
| St. Charles Township | Floyd County | 2 | 1,376 |
| St. Clair Township (Benton County) | Benton County | 5 | 386 |
| St. Clair Township (Monona County) | Monona County | 3 | 456 |
| St. Donatus | Jackson County | 1 | 109 |
| St. John Township | Harrison County | 1 | 4,065 |
| St. Joseph | Kossuth County | 1 | 42 |
| St. Lucas | Fayette County | 2 | 109 |
| St. Marys | Warren County | 3 | 126 |
| St. Marys Township | Mills County | 3 | 97 |
| St. Olaf | Clayton County | 2 | 130 |
| St. Paul | Lee County | 2 | 80 |
| Stacyville | Mitchell County | 1 | 502 |
| Stacyville Township | Mitchell County | 3 | 773 |
| Stanhope | Hamilton County | 1 | 461 |
| Stanley | Buchanan County | 1 | 94 |
| Stanton | Montgomery County | 1 | 683 |
| Stanton Township | Plymouth County | 3 | 295 |
| Stanwood | Cedar County | 1 | 628 |
| Stapleton Township | Chickasaw County | 3 | 577 |
| State Center | Marshall County | 1 | 1,482 |
| State Center Township | Marshall County | 1 | 2,044 |
| Steady Run Township | Keokuk County | 4 | 313 |
| Steamboat Rock | Hardin County | 1 | 311 |
| Stockholm Township | Crawford County | 4 | 195 |
| Stockport | Van Buren County | 1 | 268 |
| Stockton | Muscatine County | 1 | 272 |
| Stone City | Jones County | 1 | 225 |
| Storm Lake | Buena Vista County | 1 | 10,541 |
| Story City | Story County | 1 | 3,416 |
| Stout | Grundy County | 1 | 215 |
| Stratford | Hamilton County | 1 | 766 |
| Strawberry Point | Clayton County | 1 | 1,365 |
| Struble | Plymouth County | 1 | 113 |
| Stuart | Guthrie County | 1 | 1,748 |
| Stuart Township | Guthrie County | 3 | 1,049 |
| Sugar Creek Township (Cedar County) | Cedar County | 3 | 337 |
| Sugar Creek Township (Poweshiek County) | Poweshiek County | 3 | 519 |
| Sugar Grove Township | Dallas County | 3 | 1,065 |
| Sully | Jasper County | 1 | 773 |
| Summerset Township | Adair County | 2 | 1,117 |
| Summit Township (Adair County) | Adair County | 2 | 1,114 |
| Summit Township (Clay County) | Clay County | 3 | 316 |
| Summit Township (Marion County) | Marion County | 4 | 1,797 |
| Summit Township (Obrien County) | Obrien County | 3 | 547 |
| Sumner | Bremer County | 1 | 2,096 |
| Sumner No. 2 Township | Bremer County | 1 | 366 |
| Sumner Township (Buchanan County) | Buchanan County | 2 | 3,615 |
| Sumner Township (Iowa County) | Iowa County | 3 | 620 |
| Sumner Township (Webster County) | Webster County | 1 | 409 |
| Sumner Township (Winneshiek County) | Winneshiek County | 3 | 352 |
| Sun Valley Lake | Ringgold County | 1 | 147 |
| Superior | Dickinson County | 1 | 162 |
| Superior Township | Dickinson County | 3 | 500 |
| Sutherland | Obrien County | 1 | 661 |
| Swaledale | Cerro Gordo County | 1 | 163 |
| Swan | Marion County | 1 | 57 |
| Swan Lake Township (Emmet County) | Emmet County | 4 | 80 |
| Swan Lake Township (Pocahontas County) | Pocahontas County | 2 | 1,490 |
| Swea City | Kossuth County | 1 | 619 |
| Swea Township | Kossuth County | 2 | 70 |
| Swedesburg | Henry County | 2 | 175 |
| Sweetland Township | Muscatine County | 3 | 2,222 |
| Swisher | Johnson County | 1 | 897 |
| Table Mound Township | Dubuque County | 2 | 3,856 |
| Tabor | Fremont County | 1 | 1,234 |
| Tama | Tama County | 1 | 2,871 |
| Tama Township (Des Moines County) | Des Moines County | 1 | 918 |
| Tama Township (Tama County) | Tama County | 2 | 3,213 |
| Tarkio Township | Page County | 3 | 160 |
| Taylor Township (Allamakee County) | Allamakee County | 1 | 448 |
| Taylor Township (Appanoose County) | Appanoose County | 2 | 754 |
| Taylor Township (Benton County) | Benton County | 1 | 956 |
| Taylor Township (Dubuque County) | Dubuque County | 3 | 4,131 |
| Taylor Township (Harrison County) | Harrison County | 3 | 518 |
| Taylor Township (Marshall County) | Marshall County | 2 | 19,972 |
| Teeds Grove | Clinton County | 1 | |
| Templeton | Carroll County | 1 | 374 |
| Tennant | Shelby County | 2 | 28 |
| Terril | Dickinson County | 1 | 322 |
| Tete Des Morts Township | Jackson County | 1 | 1,058 |
| Thayer | Union County | 1 | 85 |
| Thompson | Winnebago County | 1 | 607 |
| Thompson Township | Guthrie County | 3 | 687 |
| Thor | Humboldt County | 1 | 233 |
| Thornburg | Keokuk County | 1 | 52 |
| Thornton | Cerro Gordo County | 1 | 455 |
| Thurman | Fremont County | 1 | 167 |
| Tiffin | Johnson County | 1 | 1,857 |
| Tilden Township | Cherokee County | 3 | 192 |
| Timber Creek Township | Marshall County | 2 | 9,865 |
| Tingley | Ringgold County | 1 | 205 |
| Tingley Township | Ringgold County | 1 | 190 |
| Tippecanoe Township | Henry County | 2 | 786 |
| Tipton | Cedar County | 1 | 3,206 |
| Tipton Township | Hardin County | 2 | 1,161 |
| Titonka | Kossuth County | 1 | 405 |
| Toddville | Linn County | 1 | |
| Toeterville | Mitchell County | 1 | 23 |
| Toledo | Tama County | 1 | 2,291 |
| Toledo Township | Tama County | 3 | 2,855 |
| Toronto | Clinton County | 1 | 141 |
| Tracy | Marion County | 1 | |
| Traer | Tama County | 1 | 1,934 |
| Trenton | Henry County | 1 | 94 |
| Trenton Township | Henry County | 2 | 362 |
| Treynor | Pottawattamie County | 1 | 970 |
| Tripoli | Bremer County | 1 | 1,426 |
| Troy Mills | Linn County | 1 | |
| Troy Township (Clarke County) | Clarke County | 1 | 1,156 |
| Troy Township (Iowa County) | Iowa County | 4 | 3,570 |
| Troy Township (Monroe County) | Monroe County | 1 | 4,578 |
| Troy Township (Wright County) | Wright County | 2 | 136 |
| Truesdale | Buena Vista County | 1 | 129 |
| Truro | Madison County | 1 | 381 |
| Turin | Monona County | 1 | 100 |
| Twelve Mile Lake Township | Emmet County | 3 | 169 |
| Twin Lake Township | Hancock County | 4 | 190 |
| Twin Lakes | Calhoun County | 2 | 283 |
| Twin Lakes Township | Calhoun County | 3 | 1,279 |
| Udell | Appanoose County | 1 | 60 |
| Udell Township | Appanoose County | 3 | 350 |
| Ulster Township | Floyd County | 5 | 176 |
| Underwood | Pottawattamie County | 1 | 864 |
| Union | Hardin County | 1 | 528 |
| Union City Township | Allamakee County | 2 | 172 |
| Union Prairie Township | Allamakee County | 2 | 715 |
| Union Township (Adair County) | Adair County | 3 | 125 |
| Union Township (Adams County) | Adams County | 2 | 88 |
| Union Township (Appanoose County) | Appanoose County | 2 | 140 |
| Union Township (Benton County) | Benton County | 3 | 948 |
| Union Township (Black Hawk County) | Black Hawk County | 3 | 705 |
| Union Township (Boone County) | Boone County | 2 | 417 |
| Union Township (Calhoun County) | Calhoun County | 3 | 356 |
| Union Township (Carroll County) | Carroll County | 2 | 1,415 |
| Union Township (Cass County) | Cass County | 3 | 382 |
| Union Township (Cerro Gordo County) | Cerro Gordo County | 3 | 150 |
| Union Township (Crawford County) | Crawford County | 2 | 663 |
| Union Township (Dallas County) | Dallas County | 4 | 1,911 |
| Union Township (Davis County) | Davis County | 4 | 165 |
| Union Township (Delaware County) | Delaware County | 2 | 460 |
| Union Township (Des Moines County) | Des Moines County | 4 | 629 |
| Union Township (Fayette County) | Fayette County | 2 | 244 |
| Union Township (Floyd County) | Floyd County | 2 | 652 |
| Union Township (Guthrie County) | Guthrie County | 2 | 69 |
| Union Township (Hardin County) | Hardin County | 4 | 974 |
| Union Township (Harrison County) | Harrison County | 3 | 345 |
| Union Township (Jackson County) | Jackson County | 1 | 800 |
| Union Township (Johnson County) | Johnson County | 3 | 750 |
| Union Township (Kossuth County) | Kossuth County | 3 | 325 |
| Union Township (Louisa County) | Louisa County | 2 | 68 |
| Union Township (Lucas County) | Lucas County | 5 | 237 |
| Union Township (Madison County) | Madison County | 2 | 787 |
| Union Township (Mahaska County) | Mahaska County | 2 | 177 |
| Union Township (Marion County) | Marion County | 2 | 660 |
| Union Township (Mitchell County) | Mitchell County | 4 | 116 |
| Union Township (Monroe County) | Monroe County | 3 | 994 |
| Union Township (Obrien County) | Obrien County | 2 | 1,032 |
| Union Township (Plymouth County) | Plymouth County | 3 | 98 |
| Union Township (Polk County) | Polk County | 3 | 479 |
| Union Township (Poweshiek County) | Poweshiek County | 3 | 637 |
| Union Township (Ringgold County) | Ringgold County | 1 | 277 |
| Union Township (Shelby County) | Shelby County | 2 | 640 |
| Union Township (Story County) | Story County | 4 | 1,507 |
| Union Township (Union County) | Union County | 1 | 1,300 |
| Union Township (Van Buren County) | Van Buren County | 3 | 874 |
| Union Township (Warren County) | Warren County | 6 | 453 |
| Union Township (Wayne County) | Wayne County | 4 | 139 |
| Union Township (Woodbury County) | Woodbury County | 2 | 606 |
| Union Township (Worth County) | Worth County | 3 | 458 |
| Unionville | Appanoose County | 1 | 69 |
| University Heights | Johnson County | 1 | 1,318 |
| University Park | Mahaska County | 1 | 576 |
| Urbana | Benton County | 1 | 1,437 |
| Urbana Township | Monroe County | 3 | 176 |
| Urbandale | Polk County | 2 | 39,426 |
| Ute | Monona County | 1 | 348 |
| Utica Township | Chickasaw County | 3 | 272 |
| Vail | Crawford County | 1 | 396 |
| Valeria | Jasper County | 1 | 69 |
| Valley Township (Guthrie County) | Guthrie County | 3 | 1,818 |
| Valley Township (Page County) | Page County | 3 | 332 |
| Valley Township (Pottawattamie County) | Pottawattamie County | 3 | 324 |
| Van Buren Township (Jackson County) | Jackson County | 3 | 1,624 |
| Van Buren Township (Keokuk County) | Keokuk County | 3 | 305 |
| Van Buren Township (Lee County) | Lee County | 3 | 280 |
| Van Buren Township (Van Buren County) | Van Buren County | 3 | 1,247 |
| Van Horne | Benton County | 1 | 665 |
| Van Meter | Dallas County | 1 | 1,520 |
| Van Meter Township | Dallas County | 5 | 4,313 |
| Van Wert | Decatur County | 1 | 209 |
| Varina | Pocahontas County | 1 | 48 |
| Ventura | Cerro Gordo County | 1 | 734 |
| Vermillion Township | Appanoose County | 1 | 882 |
| Vernon Springs Township | Howard County | 2 | 4,391 |
| Vernon Township (Dubuque County) | Dubuque County | 2 | 4,002 |
| Vernon Township (Humboldt County) | Humboldt County | 5 | 336 |
| Vernon Township (Palo Alto County) | Palo Alto County | 3 | 109 |
| Vernon Township (Van Buren County) | Van Buren County | 4 | 230 |
| Vernon Township (Wright County) | Wright County | 3 | 153 |
| Victor | Iowa County | 1 | 996 |
| Victoria Township | Cass County | 2 | 104 |
| Victory Township | Guthrie County | 4 | 688 |
| Vienna Township | Marshall County | 4 | 222 |
| Village Township | Van Buren County | 3 | 253 |
| Villisca | Montgomery County | 1 | 1,274 |
| Vincent | Webster County | 1 | 182 |
| Vining | Tama County | 1 | 47 |
| Vinton | Benton County | 1 | 5,253 |
| Viola Township (Audubon County) | Audubon County | 2 | 89 |
| Viola Township (Osceola County) | Osceola County | 2 | 79 |
| Viola Township (Sac County) | Sac County | 3 | 824 |
| Virginia Township | Warren County | 3 | 976 |
| Volga | Clayton County | 1 | 200 |
| Volga Township | Clayton County | 5 | 681 |
| Wacousta Township | Humboldt County | 3 | 106 |
| Wadena | Fayette County | 1 | 405 |
| Wagner Township | Clayton County | 4 | 314 |
| Wahpeton | Dickinson County | 3 | 376 |
| Walcott | Scott County | 1 | 1,644 |
| Walford | Benton County | 1 | 1,673 |
| Walker | Linn County | 1 | 679 |
| Wall Lake | Sac County | 1 | 819 |
| Wall Lake Township (Sac County) | Sac County | 2 | 1,254 |
| Wall Lake Township (Wright County) | Wright County | 4 | 140 |
| Wallingford | Emmet County | 1 | 173 |
| Walnut | Pottawattamie County | 1 | 767 |
| Walnut Township (Adair County) | Adair County | 2 | 224 |
| Walnut Township (Appanoose County) | Appanoose County | 3 | 707 |
| Walnut Township (Dallas County) | Dallas County | 5 | 34,459 |
| Walnut Township (Fremont County) | Fremont County | 2 | 104 |
| Walnut Township (Jefferson County) | Jefferson County | 1 | 144 |
| Walnut Township (Madison County) | Madison County | 4 | 323 |
| Walnut Township (Palo Alto County) | Palo Alto County | 3 | 1,172 |
| Walnut Township (Polk County) | Polk County | 7 | 68,743 |
| Walnut Township (Wayne County) | Wayne County | 1 | 1,076 |
| Wapello | Louisa County | 1 | 1,898 |
| Wapello Township | Louisa County | 3 | 2,566 |
| Wapsinonoc Township | Muscatine County | 2 | 4,512 |
| Ward Township | Clarke County | 2 | 305 |
| Warren Township (Bremer County) | Bremer County | 2 | 298 |
| Warren Township (Keokuk County) | Keokuk County | 3 | 561 |
| Warren Township (Lucas County) | Lucas County | 2 | 237 |
| Warren Township (Poweshiek County) | Poweshiek County | 3 | 302 |
| Warren Township (Story County) | Story County | 3 | 716 |
| Warren Township (Wayne County) | Wayne County | 3 | 620 |
| Washburn | Black Hawk County | 3 | 872 |
| Washington | Washington County | 1 | 7,277 |
| Washington Township (Adair County) | Adair County | 4 | 239 |
| Washington Township (Adams County) | Adams County | 3 | 65 |
| Washington Township (Appanoose County) | Appanoose County | 2 | 786 |
| Washington Township (Black Hawk County) | Black Hawk County | 2 | 790 |
| Washington Township (Bremer County) | Bremer County | 4 | 529 |
| Washington Township (Buchanan County) | Buchanan County | 2 | 4,134 |
| Washington Township (Buena Vista County) | Buena Vista County | 2 | 677 |
| Washington Township (Butler County) | Butler County | 3 | 265 |
| Washington Township (Carroll County) | Carroll County | 4 | 281 |
| Washington Township (Cass County) | Cass County | 2 | 280 |
| Washington Township (Chickasaw County) | Chickasaw County | 3 | 1,071 |
| Washington Township (Clarke County) | Clarke County | 3 | 173 |
| Washington Township (Clinton County) | Clinton County | 3 | 228 |
| Washington Township (Crawford County) | Crawford County | 5 | 157 |
| Washington Township (Dallas County) | Dallas County | 3 | 257 |
| Washington Township (Des Moines County) | Des Moines County | 3 | 230 |
| Washington Township (Dubuque County) | Dubuque County | 5 | 321 |
| Washington Township (Fremont County) | Fremont County | 4 | 248 |
| Washington Township (Greene County) | Greene County | 5 | 311 |
| Washington Township (Grundy County) | Grundy County | 3 | 390 |
| Washington Township (Harrison County) | Harrison County | 2 | 668 |
| Washington Township (Iowa County) | Iowa County | 4 | 702 |
| Washington Township (Jackson County) | Jackson County | 4 | 375 |
| Washington Township (Jasper County) | Jasper County | 3 | 2,333 |
| Washington Township (Johnson County) | Johnson County | 4 | 1,108 |
| Washington Township (Jones County) | Jones County | 2 | 385 |
| Washington Township (Keokuk County) | Keokuk County | 3 | 1,094 |
| Washington Township (Lee County) | Lee County | 3 | 1,842 |
| Washington Township (Linn County) | Linn County | 3 | 3,380 |
| Washington Township (Lucas County) | Lucas County | 2 | 829 |
| Washington Township (Marion County) | Marion County | 4 | 686 |
| Washington Township (Marshall County) | Marshall County | 3 | 701 |
| Washington Township (Montgomery County) | Montgomery County | 2 | 220 |
| Washington Township (Page County) | Page County | 3 | 172 |
| Washington Township (Plymouth County) | Plymouth County | 2 | 649 |
| Washington Township (Polk County) | Polk County | 3 | 437 |
| Washington Township (Pottawattamie County) | Pottawattamie County | 5 | 351 |
| Washington Township (Poweshiek County) | Poweshiek County | 2 | 341 |
| Washington Township (Ringgold County) | Ringgold County | 2 | 623 |
| Washington Township (Shelby County) | Shelby County | 3 | 531 |
| Washington Township (Sioux County) | Sioux County | 2 | 135 |
| Washington Township (Story County) | Story County | 6 | 45,725 |
| Washington Township (Taylor County) | Taylor County | 2 | 233 |
| Washington Township (Van Buren County) | Van Buren County | 3 | 268 |
| Washington Township (Wapello County) | Wapello County | 5 | 1,145 |
| Washington Township (Washington County) | Washington County | 2 | 8,141 |
| Washington Township (Wayne County) | Wayne County | 2 | 201 |
| Washington Township (Webster County) | Webster County | 3 | 591 |
| Washington Township (Winneshiek County) | Winneshiek County | 3 | 726 |
| Washta | Cherokee County | 1 | 273 |
| Waterford Township (Clay County) | Clay County | 2 | 146 |
| Waterford Township (Clinton County) | Clinton County | 3 | 583 |
| Waterloo | Black Hawk County | 3 | 68,248 |
| Waterloo Township | Allamakee County | 2 | 239 |
| Waterman Township | Obrien County | 2 | 752 |
| Waterville | Allamakee County | 1 | 140 |
| Watkins | Benton County | 1 | 85 |
| Waubonsie Township | Ringgold County | 2 | 70 |
| Waucoma | Fayette County | 1 | 270 |
| Waukee | Dallas County | 1 | 14,108 |
| Waukon | Allamakee County | 1 | 3,886 |
| Waveland Township | Pottawattamie County | 4 | 331 |
| Waverly | Bremer County | 1 | 9,881 |
| Wayland | Henry County | 1 | 1,048 |
| Wayne Township (Henry County) | Henry County | 3 | 561 |
| Wayne Township (Jones County) | Jones County | 3 | 722 |
| Wayne Township (Mitchell County) | Mitchell County | 2 | 442 |
| Wayne Township (Monroe County) | Monroe County | 1 | 114 |
| Weaver Township | Humboldt County | 2 | 417 |
| Webb | Clay County | 1 | 151 |
| Webster | Keokuk County | 1 | 94 |
| Webster City | Hamilton County | 1 | 8,024 |
| Webster Township (Hamilton County) | Hamilton County | 3 | 174 |
| Webster Township (Madison County) | Madison County | 2 | 150 |
| Webster Township (Polk County) | Polk County | 6 | 62,820 |
| Webster Township (Webster County) | Webster County | 5 | 265 |
| Welcome Township | Sioux County | 4 | 2,537 |
| Weldon | Decatur County | 1 | 140 |
| Wellman | Washington County | 1 | 1,542 |
| Wells Township | Appanoose County | 1 | 381 |
| Wellsburg | Grundy County | 1 | 835 |
| Welton | Clinton County | 1 | 150 |
| Welton Township | Clinton County | 4 | 456 |
| Wesley | Kossuth County | 1 | 363 |
| Wesley Township | Kossuth County | 3 | 423 |
| West Amana | Iowa County | 2 | 112 |
| West Bend | Kossuth County | 1 | 776 |
| West Bend Township | Palo Alto County | 1 | 956 |
| West Branch | Cedar County | 1 | 2,606 |
| West Branch Township | Sioux County | 3 | 7,117 |
| West Burlington | Des Moines County | 1 | 2,968 |
| West Chester | Washington County | 1 | 118 |
| West Des Moines | Polk County | 2 | 57,041 |
| West Des Moines Township | Mahaska County | 2 | 265 |
| West Fork Township (Franklin County) | Franklin County | 4 | 178 |
| West Fork Township (Monona County) | Monona County | 2 | 286 |
| West Fork Township (Woodbury County) | Woodbury County | 5 | 266 |
| West Grove Township | Davis County | 2 | 373 |
| West Holman Township | Osceola County | 2 | 1,963 |
| West Lancaster Township | Keokuk County | 3 | 228 |
| West Liberty | Muscatine County | 1 | 3,710 |
| West Lincoln Township | Mitchell County | 3 | 229 |
| West Lucas Township | Johnson County | 4 | 9,775 |
| West Okoboji | Dickinson County | 2 | 376 |
| West Point | Lee County | 1 | 998 |
| West Point Township (Butler County) | Butler County | 3 | 1,484 |
| West Point Township (Lee County) | Lee County | 2 | 1,533 |
| West Side Township | Crawford County | 2 | 1,051 |
| West Township | Montgomery County | 4 | 121 |
| West Union | Fayette County | 1 | 2,683 |
| Westburg Township | Buchanan County | 2 | 473 |
| Westfield | Plymouth County | 1 | 169 |
| Westfield Township (Fayette County) | Fayette County | 5 | 318 |
| Westfield Township (Plymouth County) | Plymouth County | 3 | 341 |
| Westgate | Fayette County | 1 | 269 |
| Weston | Pottawattamie County | 1 | 172 |
| Westphalia | Shelby County | 1 | 103 |
| Westphalia Township | Shelby County | 4 | 622 |
| Westport Township | Dickinson County | 3 | 43 |
| Westside | Crawford County | 1 | 350 |
| Westwood | Henry County | 1 | 124 |
| Wever | Lee County | 1 | 112 |
| What Cheer | Keokuk County | 1 | 642 |
| Wheatland | Clinton County | 1 | 787 |
| Wheatland Township | Carroll County | 3 | 664 |
| Wheeler Township (Lyon County) | Lyon County | 2 | 1,128 |
| Wheeler Township (Sac County) | Sac County | 2 | 127 |
| White Breast Township | Warren County | 2 | 533 |
| White Cloud Township | Mills County | 2 | 140 |
| White Oak Township (Mahaska County) | Mahaska County | 4 | 414 |
| White Oak Township (Warren County) | Warren County | 1 | 1,252 |
| Whitebreast Township | Lucas County | 2 | 412 |
| Whitewater Township | Dubuque County | 4 | 1,229 |
| Whiting | Monona County | 1 | 691 |
| Whittemore | Kossuth County | 1 | 597 |
| Whittemore Township | Kossuth County | 3 | 776 |
| Whitten | Hardin County | 1 | 75 |
| Willey | Carroll County | 1 | 70 |
| Williams | Hamilton County | 1 | 508 |
| Williams Township (Calhoun County) | Calhoun County | 3 | 130 |
| Williams Township (Hamilton County) | Hamilton County | 3 | 457 |
| Williamsburg | Iowa County | 1 | 3,060 |
| Williamson | Lucas County | 1 | 133 |
| Willow Township (Cherokee County) | Cherokee County | 4 | 597 |
| Willow Township (Crawford County) | Crawford County | 4 | 142 |
| Willow Township (Greene County) | Greene County | 4 | 134 |
| Willow Township (Monona County) | Monona County | 4 | 129 |
| Willow Township (Woodbury County) | Woodbury County | 2 | 559 |
| Wilson Township | Osceola County | 2 | 167 |
| Wilton | Muscatine County | 1 | 2,800 |
| Wilton Township | Muscatine County | 2 | 3,339 |
| Windsor Heights | Polk County | 1 | 4,857 |
| Windsor Township | Fayette County | 3 | 756 |
| Winfield | Henry County | 1 | 1,092 |
| Winfield Township | Scott County | 3 | 2,115 |
| Winterset | Madison County | 1 | 5,170 |
| Winthrop | Buchanan County | 1 | 892 |
| Wiota | Cass County | 1 | 121 |
| Wisner Township | Franklin County | 4 | 45 |
| Woden | Hancock County | 1 | 234 |
| Wolf Creek Township | Woodbury County | 3 | 112 |
| Woodbine | Harrison County | 1 | 1,699 |
| Woodburn | Clarke County | 1 | 245 |
| Woodbury Township | Woodbury County | 4 | 5,884 |
| Woodland Township | Decatur County | 3 | 42 |
| Woodward | Dallas County | 1 | 1,251 |
| Woolstock | Wright County | 1 | 190 |
| Woolstock Township | Wright County | 3 | 355 |
| Worth Township | Boone County | 3 | 881 |
| Worthington | Dubuque County | 1 | 393 |
| Wright Township (Pottawattamie County) | Pottawattamie County | 3 | 94 |
| Wright Township (Wayne County) | Wayne County | 4 | 284 |
| Wyacondah Township | Davis County | 1 | 154 |
| Wyoming | Jones County | 1 | 421 |
| Wyoming Township | Jones County | 4 | 943 |
| Yale | Guthrie County | 1 | 254 |
| Yarmouth | Des Moines County | 1 | 73 |
| Yell Township (Boone County) | Boone County | 3 | 1,993 |
| Yell Township (Webster County) | Webster County | 3 | 41 |
| Yellow Springs Township | Des Moines County | 3 | 446 |
| Yetter | Calhoun County | 1 | 11 |
| York Township (Iowa County) | Iowa County | 2 | 467 |
| York Township (Pottawattamie County) | Pottawattamie County | 5 | 248 |
| York Township (Tama County) | Tama County | 4 | 455 |
| Yorktown | Page County | 1 | 80 |
| Zearing | Story County | 1 | 552 |
| Zwingle | Dubuque County | 1 | 92 |