| Place Name | County | Total ZIP Codes | Population () |
|---|
| Abell | Saint Marys County | 1 | |
| Aberdeen | Harford County | 1 | 14,958 |
| Aberdeen Proving Ground | Harford County | 1 | 1,836 |
| Abingdon | Harford County | 1 | 5,324 |
| Accident | Garrett County | 1 | 299 |
| Accokeek | Prince Georges County | 1 | 10,528 |
|
| Adamstown | Frederick County | 1 | 2,364 |
| Adelphi | Prince Georges County | 4 | 15,045 |
| Algonquin | Dorchester County | 1 | 1,434 |
| Allen | Wicomico County | 1 | 168 |
| Andrews AFB | Prince Georges County | 3 | 3,210 |
|
| Annapolis | Anne Arundel County | 3 | 38,309 |
| Annapolis Neck | Anne Arundel County | 3 | 11,274 |
| Antietam | Washington County | 1 | 121 |
| Aquasco | Prince Georges County | 1 | 807 |
| Arbutus | Baltimore County | 4 | 19,913 |
| Arden on the Severn | Anne Arundel County | 1 | 2,151 |
| Arnold | Anne Arundel County | 1 | 22,626 |
| Ashton | Montgomery County | 1 | |
| Ashton-Sandy Spring | Montgomery County | 9 | 5,224 |
| Aspen Hill | Montgomery County | 4 | 48,858 |
|
| Avenue | Saint Marys County | 1 | |
| Baden | Prince Georges County | 2 | 2,243 |
| Bagtown | Washington County | 2 | 349 |
| Bakersville | Washington County | 2 | 0 |
| Baldwin | Baltimore County | 1 | |
| Ballenger Creek | Frederick County | 3 | 18,490 |
| Baltimore | Baltimore City County | 22 | 620,644 |
| Baltimore Highlands | Baltimore County | 1 | 7,135 |
| Barclay | Queen Annes County | 1 | 83 |
| Barnesville | Montgomery County | 1 | 198 |
|
| Barrelville | Allegany County | 1 | 27 |
| Barstow | Calvert County | 1 | |
| Barton | Allegany County | 1 | 602 |
| Bartonsville | Frederick County | 3 | 1,172 |
| Beallsville | Montgomery County | 1 | |
| Beaver Creek | Washington County | 3 | 101 |
| Bel Air | Harford County | 1 | 10,172 |
| Bel Air (Allegany County) | Allegany County | 1 | 1,098 |
| Bel Air North | Harford County | 4 | 30,723 |
| Bel Air South | Harford County | 5 | 46,512 |
| Bel Alton | Charles County | 1 | |
| Belcamp | Harford County | 1 | |
| Beltsville | Prince Georges County | 1 | 16,673 |
| Benedict | Charles County | 1 | 259 |
| Benson | Harford County | 1 | |
| Bensville | Charles County | 7 | 11,941 |
| Berlin | Worcester County | 1 | 4,455 |
| Berwyn Heights | Prince Georges County | 2 | 3,126 |
| Bethesda | Montgomery County | 4 | 59,591 |
| Bethlehem | Caroline County | 1 | |
|
| Betterton | Kent County | 1 | 440 |
| Bier | Allegany County | 2 | 298 |
| Big Pool | Washington County | 1 | 53 |
| Big Spring | Washington County | 1 | 127 |
| Bishopville | Worcester County | 1 | 252 |
| Bittinger | Garrett County | 1 | |
| Bivalve | Wicomico County | 1 | 248 |
| Bladensburg | Prince Georges County | 1 | 9,140 |
| Bloomington | Garrett County | 1 | 299 |
| Boonsboro | Washington County | 1 | 3,394 |
| Boring | Baltimore County | 1 | |
| Bowie | Prince Georges County | 4 | 55,059 |
| Bowleys Quarters | Baltimore County | 2 | 6,523 |
| Bowling Green | Allegany County | 1 | 1,487 |
| Bowmans Addition | Allegany County | 1 | 679 |
| Boyds | Montgomery County | 1 | |
| Bozman | Talbot County | 1 | |
| Braddock Heights | Frederick County | 4 | 2,882 |
| Brandywine | Prince Georges County | 1 | 7,601 |
| Breathedsville | Washington County | 2 | 241 |
| Brentwood | Prince Georges County | 1 | 3,053 |
| Brinklow | Montgomery County | 1 | |
| Brock Hall | Prince Georges County | 2 | 9,158 |
| Brookeville | Montgomery County | 1 | 149 |
| Brooklandville | Baltimore County | 1 | |
| Brooklyn | Baltimore City County | 1 | |
| Brooklyn Park | Anne Arundel County | 2 | 14,650 |
| Brookmont | Montgomery County | 3 | 3,881 |
| Brookview | Dorchester County | 1 | 84 |
| Broomes Island | Calvert County | 1 | 244 |
| Brown Station | Prince Georges County | 2 | 3,596 |
| Brownsville | Washington County | 1 | 267 |
| Brunswick | Frederick County | 1 | 5,882 |
| Bryans Road | Charles County | 1 | 7,635 |
| Bryantown | Charles County | 1 | 828 |
| Buckeystown | Frederick County | 1 | 905 |
| Burkittsville | Frederick County | 1 | 148 |
| Burnt Mills | Montgomery County | 2 | 4,083 |
| Burtonsville | Montgomery County | 1 | 8,259 |
| Bushwood | Saint Marys County | 1 | |
| Butler | Baltimore County | 1 | |
| Butlertown | Kent County | 1 | 476 |
| Cabin John | Montgomery County | 1 | 2,260 |
| California | Saint Marys County | 1 | 11,055 |
| Callaway | Saint Marys County | 1 | 1,320 |
| Calvert Beach | Calvert County | 1 | 751 |
| Calverton | Montgomery County | 4 | 18,442 |
| Cambridge | Dorchester County | 1 | 12,381 |
| Camp Springs | Prince Georges County | 4 | 19,034 |
| Cape St. Claire | Anne Arundel County | 3 | 8,746 |
| Capitol Heights | Prince Georges County | 1 | 4,360 |
| Carlos | Allegany County | 1 | 165 |
| Carmody Hills-Pepper Mill Village | Prince Georges County | 1 | |
| Carney | Baltimore County | 3 | 27,589 |
| Cascade | Washington County | 1 | |
| Catonsville | Baltimore County | 1 | 42,527 |
| Cavetown | Washington County | 1 | 1,588 |
| Cearfoss | Washington County | 1 | 93 |
| Cecilton | Cecil County | 1 | 602 |
| Cedar Heights | Prince Georges County | 2 | 1,977 |
| Cedarville | Prince Georges County | 2 | 547 |
| Centreville | Queen Annes County | 1 | 4,255 |
| Chance | Somerset County | 1 | 339 |
| Chaptico | Saint Marys County | 1 | |
| Charlestown | Cecil County | 1 | 1,122 |
| Charlotte Hall | Saint Marys County | 1 | 1,143 |
| Charlton | Washington County | 2 | 124 |
| Chase | Baltimore County | 1 | |
| Cheltenham | Prince Georges County | 1 | |
| Chesapeake Beach | Calvert County | 1 | 5,674 |
| Chesapeake City | Cecil County | 1 | 683 |
| Chesapeake Landing | Kent County | 2 | 132 |
| Chesapeake Ranch Estates | Calvert County | 1 | 11,180 |
| Chesapeake Ranch Estates-Drum Point | Calvert County | 1 | |
| Chester | Queen Annes County | 1 | 4,154 |
| Chestertown | Kent County | 1 | 5,297 |
| Cheverly | Prince Georges County | 4 | 6,218 |
| Chevy Chase | Montgomery County | 1 | 2,846 |
| Chevy Chase (Montgomery County) | Montgomery County | 4 | 9,344 |
| Chevy Chase Section Five | Montgomery County | 1 | 753 |
| Chevy Chase Section Three | Montgomery County | 1 | 743 |
| Chevy Chase View | Montgomery County | 1 | 1,030 |
| Chevy Chase Village | Montgomery County | 1 | 1,983 |
| Chewsville | Washington County | 1 | 143 |
| Childs | Cecil County | 1 | |
| Chillum | Prince Georges County | 4 | 36,023 |
| Choptank | Caroline County | 1 | 132 |
| Church Creek | Dorchester County | 1 | 109 |
| Church Hill | Queen Annes County | 1 | 687 |
| Churchton | Anne Arundel County | 1 | |
| Churchville | Harford County | 1 | |
| Claiborne | Talbot County | 1 | |
| Clarksburg | Montgomery County | 1 | 13,394 |
| Clarksville | Howard County | 1 | |
| Clarysville | Allegany County | 1 | 155 |
| Clear Spring | Washington County | 1 | 389 |
| Clements | Saint Marys County | 1 | |
| Clinton | Prince Georges County | 1 | 36,044 |
| Clover Hill | Frederick County | 1 | |
| Cloverly | Montgomery County | 7 | 14,735 |
| Cobb Island | Charles County | 1 | 676 |
| Cockeysville | Baltimore County | 1 | 19,759 |
| Colesville | Montgomery County | 4 | 14,709 |
| College Park | Prince Georges County | 2 | 30,478 |
| Colmar Manor | Prince Georges County | 2 | 1,428 |
| Colora | Cecil County | 1 | |
| Coltons Point | Saint Marys County | 1 | |
| Columbia | Howard County | 3 | 100,735 |
| Compton | Saint Marys County | 1 | |
| Conowingo | Cecil County | 1 | |
| Cooksville | Howard County | 1 | |
| Coral Hills | Prince Georges County | 2 | 8,921 |
| Cordova | Talbot County | 1 | 493 |
| Corriganville | Allegany County | 1 | 564 |
| Cottage City | Prince Georges County | 3 | 1,188 |
| Crapo | Dorchester County | 1 | |
| Crellin | Garrett County | 1 | 92 |
| Cresaptown | Allegany County | 2 | 4,338 |
| Crisfield | Somerset County | 1 | 2,716 |
| Crocheron | Dorchester County | 1 | |
| Crofton | Anne Arundel County | 1 | 28,086 |
| Croom | Prince Georges County | 4 | 2,581 |
| Crownsville | Anne Arundel County | 1 | 1,950 |
| Crumpton | Queen Annes County | 1 | 324 |
| Cumberland | Allegany County | 1 | 20,776 |
| Curtis Bay | Baltimore City County | 1 | |
| Damascus | Montgomery County | 1 | 15,478 |
| Dameron | Saint Marys County | 1 | |
| Dames Quarter | Somerset County | 2 | 92 |
| Danville | Allegany County | 1 | 231 |
| Dargan | Washington County | 1 | 323 |
| Darlington | Harford County | 1 | 484 |
| Darnestown | Montgomery County | 7 | 6,735 |
| Davidsonville | Anne Arundel County | 1 | |
| Dawson | Allegany County | 2 | 220 |
| Dayton | Howard County | 1 | |
| Deal Island | Somerset County | 1 | 411 |
| Deale | Anne Arundel County | 1 | 4,655 |
| Deer Park | Garrett County | 1 | 401 |
| Delmar | Wicomico County | 1 | 2,976 |
| Denton | Caroline County | 1 | 4,359 |
| Derwood | Montgomery County | 1 | 2,161 |
| Detmold | Allegany County | 1 | 185 |
| Dickerson | Montgomery County | 1 | |
| District Heights | Prince Georges County | 1 | 5,870 |
| Dowell | Calvert County | 1 | |
| Downsville | Washington County | 2 | 244 |
| Drayden | Saint Marys County | 1 | |
| Drum Point | Calvert County | 1 | 2,565 |
| Dundalk | Baltimore County | 1 | 62,459 |
| Dunkirk | Calvert County | 1 | 2,547 |
| Eagle Harbor | Prince Georges County | 1 | 59 |
| Eakles Mill | Washington County | 1 | 0 |
| Earleville | Cecil County | 1 | |
| East New Market | Dorchester County | 1 | 370 |
| East Riverdale | Prince Georges County | 5 | 16,005 |
| Easton | Talbot County | 1 | 16,044 |
| Eckhart Mines | Allegany County | 1 | 950 |
| Eden | Somerset County | 1 | 661 |
| Edesville | Kent County | 1 | 276 |
| Edgemere | Baltimore County | 3 | 8,516 |
| Edgemont | Washington County | 1 | 254 |
| Edgewater | Anne Arundel County | 1 | 9,219 |
| Edgewood | Harford County | 1 | 25,719 |
| Edmonston | Prince Georges County | 3 | 1,408 |
| Eldersburg | Carroll County | 7 | 31,650 |
| Eldorado | Dorchester County | 1 | 69 |
| Elk Mills | Cecil County | 1 | |
| Elkridge | Howard County | 1 | 14,959 |
| Elkton | Cecil County | 1 | 15,393 |
| Ellerslie | Allegany County | 1 | 349 |
| Ellicott City | Howard County | 2 | 66,476 |
| Elliott | Dorchester County | 1 | 20 |
| Emmitsburg | Frederick County | 1 | 2,903 |
| Ernstville | Washington County | 1 | 0 |
| Essex | Baltimore County | 1 | 38,666 |
| Ewell | Somerset County | 1 | |
| Fairland | Montgomery County | 3 | 24,067 |
| Fairlee | Kent County | 1 | 222 |
| Fairmount | Somerset County | 1 | 387 |
| Fairmount Heights | Prince Georges County | 1 | 1,450 |
| Fairplay | Washington County | 1 | 558 |
| Fairview | Washington County | 2 | 0 |
| Fairwood | Prince Georges County | 2 | 4,784 |
| Fallston | Harford County | 1 | 8,327 |
| Faulkner | Charles County | 1 | |
| Federalsburg | Caroline County | 1 | 2,733 |
| Ferndale | Anne Arundel County | 3 | 17,517 |
| Finksburg | Carroll County | 1 | |
| Finzel | Garrett County | 2 | 439 |
| Fishing Creek | Dorchester County | 1 | 90 |
| Flintstone | Allegany County | 1 | 114 |
| Flower Hill | Montgomery County | 3 | 14,185 |
| Forest Glen | Montgomery County | 2 | 6,865 |
| Forest Heights | Prince Georges County | 1 | 2,072 |
| Forest Hill | Harford County | 1 | |
| Forestville | Prince Georges County | 3 | 11,942 |
| Fork | Baltimore County | 1 | |
| Fort Howard | Baltimore County | 1 | |
| Fort Meade | Anne Arundel County | 7 | 10,712 |
| Fort Ritchie | Washington County | 2 | 337 |
| Fort Washington | Prince Georges County | 1 | 24,841 |
| Fountainhead-Orchard Hills | Washington County | 2 | 5,962 |
| Four Corners | Montgomery County | 2 | 7,645 |
| Franklin | Allegany County | 1 | 230 |
| Frederick | Frederick County | 4 | 65,171 |
| Freeland | Baltimore County | 1 | |
| Frenchtown-Rumbly | Somerset County | 1 | 55 |
| Friendly | Prince Georges County | 2 | 9,407 |
| Friendship | Anne Arundel County | 1 | 450 |
| Friendship Heights Village | Montgomery County | 1 | 5,253 |
| Friendship Village | Montgomery County | 1 | |
| Friendsville | Garrett County | 1 | 512 |
| Frostburg | Allegany County | 1 | 8,886 |
| Fruitland | Wicomico County | 1 | 4,908 |
| Fulton | Howard County | 1 | 2,030 |
| Funkstown | Washington County | 1 | 1,051 |
| Gaithersburg | Montgomery County | 3 | 60,223 |
| Galena | Kent County | 1 | 764 |
| Galestown | Dorchester County | 1 | 104 |
| Galesville | Anne Arundel County | 1 | 570 |
| Gambrills | Anne Arundel County | 1 | 2,539 |
| Gapland | Washington County | 1 | 148 |
| Garrett Park | Montgomery County | 1 | 1,050 |
| Garretts Mill | Washington County | 1 | 270 |
| Garrison | Baltimore County | 3 | 7,485 |
| Georgetown | Kent County | 1 | 77 |
| Germantown | Montgomery County | 2 | 88,039 |
| Gibson Island | Anne Arundel County | 1 | |
| Gilmore | Allegany County | 2 | 56 |
| Girdletree | Worcester County | 1 | 231 |
| Glassmanor | Prince Georges County | 1 | 17,400 |
| Glen Arm | Baltimore County | 1 | |
| Glen Burnie | Anne Arundel County | 2 | 66,456 |
| Glen Echo | Montgomery County | 1 | 232 |
| Glenarden | Prince Georges County | 4 | 6,056 |
| Glenelg | Howard County | 1 | |
| Glenmont | Montgomery County | 3 | 13,619 |
| Glenn Dale | Prince Georges County | 1 | 13,973 |
| Glenwood | Howard County | 1 | |
| Glyndon | Baltimore County | 1 | |
| Golden Beach | Saint Marys County | 3 | 4,086 |
| Goldsboro | Caroline County | 1 | 191 |
| Gorman | Garrett County | 1 | 65 |
| Graceham | Frederick County | 1 | 304 |
| Grahamtown | Allegany County | 1 | 360 |
| Grantsville | Garrett County | 1 | 842 |
| Grasonville | Queen Annes County | 1 | 3,307 |
| Great Mills | Saint Marys County | 1 | |
| Green Valley | Frederick County | 5 | 12,391 |
| Greenbelt | Prince Georges County | 1 | 23,113 |
| Greensboro | Caroline County | 1 | 2,341 |
| Greensburg | Washington County | 1 | 192 |
| Gunpowder | Baltimore County | 1 | |
| Gwynn Oak | Baltimore City County | 1 | |
| Hagerstown | Washington County | 2 | 40,078 |
| Halethorpe | Baltimore County | 1 | |
| Halfway | Washington County | 2 | 10,217 |
| Hampstead | Carroll County | 1 | 6,299 |
| Hampton | Baltimore County | 5 | 4,913 |
| Hancock | Washington County | 1 | 1,683 |
| Hanover | Howard County | 1 | |
| Harmans | Anne Arundel County | 1 | |
| Harwood | Anne Arundel County | 1 | |
| Havre de Grace | Harford County | 1 | 13,066 |
| Hebron | Wicomico County | 1 | 1,022 |
| Helen | Saint Marys County | 1 | |
| Henderson | Caroline County | 1 | 156 |
| Herald Harbor | Anne Arundel County | 1 | 2,297 |
| Highfield-Cascade | Washington County | 1 | 929 |
| Highland | Howard County | 1 | 1,074 |
| Highland Beach | Anne Arundel County | 1 | 89 |
| Hillandale | Montgomery County | 3 | 6,981 |
| Hillcrest Heights | Prince Georges County | 2 | 15,229 |
| Hillsboro | Caroline County | 1 | 100 |
| Hillsmere Shores | Anne Arundel County | 1 | |
| Hollywood | Saint Marys County | 1 | |
| Honeygo | Baltimore County | 3 | 11,558 |
| Hughesville | Charles County | 1 | 2,114 |
| Hunt Valley | Baltimore County | 1 | |
| Huntingtown | Calvert County | 1 | 3,883 |
| Hurlock | Dorchester County | 1 | 1,901 |
| Hutton | Garrett County | 1 | 31 |
| Hyattsville | Prince Georges County | 3 | 17,549 |
| Hydes | Baltimore County | 1 | |
| Ijamsville | Frederick County | 1 | |
| Ilchester | Howard County | 5 | 24,035 |
| Indian Head | Charles County | 1 | 3,866 |
| Indian Springs | Washington County | 1 | 96 |
| Ingleside | Queen Annes County | 1 | |
| Ironsides | Charles County | 1 | |
| Jarrettsville | Harford County | 1 | 3,326 |
| Jefferson | Frederick County | 1 | 1,788 |
| Jennings | Garrett County | 1 | 28 |
| Jessup | Anne Arundel County | 1 | 8,418 |
| Jesterville | Wicomico County | 2 | 269 |
| Joppa | Harford County | 1 | |
| Joppatowne | Harford County | 3 | 13,085 |
| Jugtown | Washington County | 2 | 341 |
| Keedysville | Washington County | 1 | 1,069 |
| Kemp Mill | Montgomery County | 3 | 12,111 |
| Kemps Mill | Washington County | 2 | 132 |
| Kennedyville | Kent County | 1 | 279 |
| Kensington | Montgomery County | 1 | 1,959 |
| Kent Narrows | Queen Annes County | 2 | 546 |
| Kettering | Prince Georges County | 1 | 13,130 |
| Keymar | Carroll County | 1 | |
| Kingstown | Queen Annes County | 1 | 2,015 |
| Kingsville | Baltimore County | 1 | 4,227 |
| Kitzmiller | Garrett County | 1 | 320 |
| Klondike | Allegany County | 1 | 350 |
| Knoxville | Frederick County | 1 | |
| Konterra | Prince Georges County | 2 | 2,528 |
| La Plata | Charles County | 1 | 8,743 |
| La Vale | Allegany County | 1 | 3,248 |
| Ladiesburg | Frederick County | 1 | |
| Lake Arbor | Prince Georges County | 4 | 10,925 |
| Lake Shore | Anne Arundel County | 2 | 18,580 |
| Landover | Prince Georges County | 4 | 22,956 |
| Landover Hills | Prince Georges County | 2 | 2,159 |
| Langley Park | Prince Georges County | 3 | 20,675 |
| Lanham | Prince Georges County | 1 | 9,606 |
| Lansdowne | Baltimore County | 1 | 9,328 |
| Lansdowne-Baltimore Highlands | Baltimore County | 1 | |
| Largo | Prince Georges County | 2 | 10,272 |
| Laurel | Prince Georges County | 3 | 25,026 |
| Layhill | Montgomery County | 2 | 5,498 |
| Laytonsville | Montgomery County | 1 | 303 |
| Leisure World | Montgomery County | 1 | 8,826 |
| Leitersburg | Washington County | 1 | 720 |
| Leonardtown | Saint Marys County | 1 | 2,986 |
| Lewistown | Frederick County | 2 | 410 |
| Lexington Park | Saint Marys County | 1 | 12,387 |
| Libertytown | Frederick County | 2 | 1,115 |
| Lineboro | Carroll County | 1 | |
| Linganore | Frederick County | 4 | 8,421 |
| Linkwood | Dorchester County | 1 | |
| Linthicum | Anne Arundel County | 3 | 10,858 |
| Linthicum Heights | Anne Arundel County | 1 | |
| Lisbon | Howard County | 2 | 19 |
| Little Orleans | Allegany County | 1 | 14 |
| Loch Lynn Heights | Garrett County | 1 | 670 |
| Lochearn | Baltimore County | 3 | 25,557 |
| Lonaconing | Allegany County | 1 | 1,205 |
| Londontowne | Anne Arundel County | 1 | |
| Long Beach | Calvert County | 2 | 1,880 |
| Long Green | Baltimore County | 1 | |
| Lothian | Anne Arundel County | 1 | |
| Loveville | Saint Marys County | 1 | |
| Luke | Allegany County | 1 | 109 |
| Lusby | Calvert County | 1 | 2,102 |
| Lutherville | Baltimore County | 1 | 6,475 |
| Lutherville-Timonium | Baltimore County | 1 | |
| Madison | Dorchester County | 1 | 133 |
| Manchester | Carroll County | 1 | 4,750 |
| Manokin | Somerset County | 1 | |
| Mapleville | Washington County | 1 | 222 |
| Marbury | Charles County | 1 | |
| Mardela Springs | Wicomico County | 1 | 246 |
| Marlboro Meadows | Prince Georges County | 2 | 3,532 |
| Marlboro Village | Prince Georges County | 2 | 9,893 |
| Marlow Heights | Prince Georges County | 3 | 6,246 |
| Marlton | Prince Georges County | 1 | 9,347 |
| Marriottsville | Howard County | 1 | |
| Martin's Additions | Montgomery County | 1 | 895 |
| Marydel | Caroline County | 2 | 208 |
| Maryland City | Anne Arundel County | 4 | 15,177 |
| Maryland Line | Baltimore County | 1 | |
| Maryland Park | Prince Georges County | 1 | 717 |
| Massey | Kent County | 1 | |
| Maugansville | Washington County | 1 | 3,138 |
| Mayo | Anne Arundel County | 2 | 8,395 |
| Mays Chapel | Baltimore County | 1 | 11,584 |
| McCoole | Allegany County | 2 | 436 |
| McHenry | Garrett County | 1 | |
| Mechanicsville | Saint Marys County | 1 | 1,563 |
| Melwood | Prince Georges County | 2 | 3,045 |
| Mercersville | Washington County | 1 | 84 |
| Middle River | Baltimore County | 1 | 25,301 |
| Middleburg | Washington County | 1 | 113 |
| Middletown | Frederick County | 1 | 4,105 |
| Midland | Allegany County | 1 | 482 |
| Midlothian | Allegany County | 1 | 305 |
| Milford Mill | Baltimore County | 4 | 29,754 |
| Millersville | Anne Arundel County | 1 | |
| Millington | Kent County | 1 | 600 |
| Mitchellville | Prince Georges County | 4 | 10,300 |
| Monkton | Baltimore County | 1 | |
| Monrovia | Frederick County | 1 | 353 |
| Montgomery Village | Montgomery County | 1 | 32,458 |
| Morganza | Saint Marys County | 1 | |
| Morningside | Prince Georges County | 3 | 1,757 |
| Moscow | Allegany County | 2 | 305 |
| Mount Aetna | Washington County | 2 | 616 |
| Mount Airy | Carroll County | 1 | 9,198 |
| Mount Briar | Washington County | 1 | 116 |
| Mount Lena | Washington County | 1 | 420 |
| Mount Rainier | Prince Georges County | 1 | 8,134 |
| Mount Savage | Allegany County | 1 | 716 |
| Mount Vernon | Somerset County | 1 | 693 |
| Mount Victoria | Charles County | 1 | |
| Mountain Lake Park | Garrett County | 1 | 2,025 |
| Myersville | Frederick County | 1 | 1,867 |
| Nanjemoy | Charles County | 1 | |
| Nanticoke | Wicomico County | 1 | 324 |
| Nanticoke Acres | Wicomico County | 1 | 61 |
| National | Allegany County | 1 | 27 |
| National Harbor | Prince Georges County | 2 | 3,610 |
| Naval Academy | Anne Arundel County | 2 | 4,937 |
| Neavitt | Talbot County | 1 | |
| New Carrollton | Prince Georges County | 4 | 12,195 |
| New Market | Frederick County | 1 | 649 |
| New Midway | Frederick County | 1 | |
| New Windsor | Carroll County | 1 | 1,411 |
| Newark | Worcester County | 1 | 170 |
| Newburg | Charles County | 1 | |
| Newcomb | Talbot County | 1 | |
| Nikep | Allegany County | 1 | 68 |
| North Beach | Calvert County | 1 | 1,882 |
| North Bethesda | Montgomery County | 7 | 42,894 |
| North Brentwood | Prince Georges County | 1 | 553 |
| North Chevy Chase | Montgomery County | 1 | 602 |
| North East | Cecil County | 1 | 3,611 |
| North Kensington | Montgomery County | 2 | 10,102 |
| North Laurel | Howard County | 4 | 19,810 |
| North Potomac | Montgomery County | 2 | 24,220 |
| Nottingham | Baltimore County | 1 | |
| Oakland | Garrett County | 1 | 2,175 |
| Ocean | Allegany County | 1 | 7 |
| Ocean City | Worcester County | 1 | 7,134 |
| Ocean Pines | Worcester County | 2 | 10,464 |
| Odenton | Anne Arundel County | 1 | 36,495 |
| Oldtown | Allegany County | 1 | 77 |
| Olney | Montgomery County | 1 | 33,789 |
| Overlea | Baltimore County | 4 | 12,728 |
| Owings | Calvert County | 1 | 2,433 |
| Owings Mills | Baltimore County | 1 | 31,930 |
| Oxford | Talbot County | 1 | 539 |
| Oxon Hill | Prince Georges County | 1 | 19,198 |
| Paramount-Long Meadow | Washington County | 1 | 2,430 |
| Park Hall | Washington County | 1 | |
| Parkton | Baltimore County | 1 | |
| Parkville | Baltimore County | 1 | 30,337 |
| Parole | Anne Arundel County | 5 | 16,300 |
| Parsonsburg | Wicomico County | 1 | 405 |
| Pasadena | Anne Arundel County | 1 | 24,400 |
| Pecktonville | Washington County | 1 | 143 |
| Peppermill Village | Prince Georges County | 2 | 4,935 |
| Perry Hall | Baltimore County | 1 | 27,978 |
| Perry Point | Cecil County | 1 | |
| Perryman | Harford County | 1 | 2,192 |
| Perryville | Cecil County | 1 | 4,357 |
| Phoenix | Baltimore County | 1 | |
| Pikesville | Baltimore County | 1 | 31,713 |
| Pinesburg | Washington County | 1 | 461 |
| Piney Point | Saint Marys County | 1 | 644 |
| Pinto | Allegany County | 1 | |
| Pittsville | Wicomico County | 1 | 1,477 |
| Pleasant Grove | Allegany County | 1 | 488 |
| Pleasant Hills | Harford County | 4 | 3,586 |
| Pocomoke City | Worcester County | 1 | 4,187 |
| Point of Rocks | Frederick County | 1 | 1,432 |
| Pomfret | Charles County | 1 | 557 |
| Pondsville | Washington County | 2 | 135 |
| Poolesville | Montgomery County | 1 | 4,931 |
| Port Deposit | Cecil County | 1 | 671 |
| Port Republic | Calvert County | 1 | |
| Port Tobacco | Charles County | 1 | |
| Port Tobacco Village | Charles County | 2 | 168 |
| Potomac | Montgomery County | 1 | 45,360 |
| Potomac Heights | Charles County | 2 | 1,076 |
| Potomac Park | Allegany County | 1 | 2,017 |
| Powellville | Wicomico County | 2 | 87 |
| Preston | Caroline County | 1 | 631 |
| Price | Queen Annes County | 1 | |
| Prince Frederick | Calvert County | 1 | 2,770 |
| Princess Anne | Somerset County | 1 | 3,252 |
| Pylesville | Harford County | 1 | 659 |
| Quantico | Wicomico County | 1 | 113 |
| Queen Anne | Queen Annes County | 1 | 361 |
| Queen Anne (Prince Georges County) | Prince Georges County | 3 | 1,180 |
| Queensland | Prince Georges County | 1 | 1,713 |
| Queenstown | Queen Annes County | 1 | 632 |
| Randallstown | Baltimore County | 1 | 32,626 |
| Rawlings | Allegany County | 1 | 773 |
| Redland | Montgomery County | 4 | 17,292 |
| Rehobeth | Somerset County | 1 | |
| Reid | Washington County | 1 | 67 |
| Reisterstown | Baltimore County | 1 | 27,431 |
| Rhodesdale | Dorchester County | 1 | |
| Riderwood | Baltimore County | 1 | |
| Ridge | Saint Marys County | 1 | |
| Ridgely | Caroline County | 1 | 1,710 |
| Ringgold | Washington County | 2 | 289 |
| Rising Sun | Cecil County | 1 | 2,797 |
| Riva | Anne Arundel County | 1 | 4,073 |
| Riverdale | Anne Arundel County | 1 | |
| Riverdale Park | Prince Georges County | 3 | 6,967 |
| Riverside | Harford County | 4 | 6,886 |
| Riviera Beach | Anne Arundel County | 3 | 11,869 |
| Robinwood | Washington County | 3 | 7,738 |
| Rock Hall | Kent County | 1 | 1,272 |
| Rock Point | Charles County | 1 | 76 |
| Rockville | Montgomery County | 4 | 60,960 |
| Rocky Ridge | Frederick County | 1 | |
| Rohrersville | Washington County | 1 | 142 |
| Romancoke | Queen Annes County | 1 | 1,717 |
| Rosaryville | Prince Georges County | 4 | 11,746 |
| Rosedale | Baltimore County | 1 | 18,224 |
| Rosemont | Frederick County | 2 | 325 |
| Rossmoor | Montgomery County | 1 | |
| Rossville | Baltimore County | 5 | 15,530 |
| Royal Oak | Talbot County | 1 | |
| Sabillasville | Frederick County | 1 | 480 |
| Saint James | Washington County | 1 | |
| Saint Leonard | Calvert County | 1 | |
| Saint Marys City | Saint Marys County | 1 | |
| Salisbury | Wicomico County | 2 | 30,407 |
| San Mar | Washington County | 1 | 348 |
| Sandy Hook | Washington County | 1 | 155 |
| Sandy Spring | Montgomery County | 1 | |
| Savage | Howard County | 1 | 6,556 |
| Scaggsville | Howard County | 5 | 8,747 |
| Scotland | Saint Marys County | 1 | |
| Seabrook | Prince Georges County | 4 | 16,231 |
| Seat Pleasant | Prince Georges County | 2 | 4,577 |
| Secretary | Dorchester County | 1 | 763 |
| Selby-on-the-Bay | Anne Arundel County | 1 | |
| Severn | Anne Arundel County | 1 | 43,690 |
| Severna Park | Anne Arundel County | 1 | 38,014 |
| Shady Side | Anne Arundel County | 1 | 6,413 |
| Shaft | Allegany County | 1 | 219 |
| Sharpsburg | Washington County | 1 | 781 |
| Sharptown | Wicomico County | 1 | 1,038 |
| Sherwood | Talbot County | 1 | |
| Showell | Worcester County | 1 | |
| Silver Hill | Prince Georges County | 2 | 5,818 |
| Silver Spring | Montgomery County | 3 | 74,476 |
| Simpsonville | Howard County | 1 | |
| Smith Island | Somerset County | 2 | 172 |
| Smithsburg | Washington County | 1 | 2,951 |
| Snow Hill | Worcester County | 1 | 2,625 |
| Solomons | Calvert County | 1 | 1,872 |
| Somerset | Montgomery County | 2 | 1,314 |
| South Kensington | Montgomery County | 3 | 7,895 |
| South Laurel | Prince Georges County | 5 | 25,207 |
| Sparrows Point | Baltimore County | 1 | |
| Spencerville | Montgomery County | 1 | 1,543 |
| Spring Gap | Allegany County | 2 | 113 |
| Spring Ridge | Frederick County | 3 | 5,797 |
| Springdale | Prince Georges County | 3 | 2,571 |
| St. George Island | Saint Marys County | 1 | 397 |
| St. James | Washington County | 2 | 3,294 |
| St. Leonard | Calvert County | 3 | 795 |
| St. Michaels | Talbot County | 1 | 974 |
| Stevenson | Baltimore County | 1 | |
| Stevensville | Queen Annes County | 1 | 6,609 |
| Still Pond | Kent County | 1 | 119 |
| Stockton | Worcester County | 1 | 63 |
| Street | Harford County | 1 | |
| Sudlersville | Queen Annes County | 1 | 340 |
| Suitland | Prince Georges County | 1 | 25,060 |
| Summerfield | Prince Georges County | 3 | 11,844 |
| Sunderland | Calvert County | 1 | |
| Swanton | Garrett County | 1 | 0 |
| Sykesville | Carroll County | 1 | 4,445 |
| Takoma Park | Montgomery County | 1 | 16,902 |
| Tall Timbers | Saint Marys County | 1 | 320 |
| Taneytown | Carroll County | 1 | 6,690 |
| Taylors Island | Dorchester County | 1 | 110 |
| Temple Hills | Prince Georges County | 1 | 7,841 |
| Templeville | Caroline County | 1 | 157 |
| Ten Mile Creek | Montgomery County | 2 | 1,074 |
| Thurmont | Frederick County | 1 | 6,204 |
| Tilghman | Talbot County | 1 | |
| Tilghman Island | Talbot County | 2 | 819 |
| Tilghmanton | Washington County | 2 | 485 |
| Timonium | Baltimore County | 3 | 9,942 |
| Toddville | Dorchester County | 1 | |
| Tolchester | Kent County | 1 | 438 |
| Towson | Baltimore County | 3 | 55,811 |
| Tracys Landing | Anne Arundel County | 1 | |
| Trappe | Talbot County | 1 | 1,169 |
| Travilah | Montgomery County | 5 | 12,384 |
| Trego-Rohrersville Station | Washington County | 2 | 190 |
| Tuscarora | Frederick County | 1 | |
| Tyaskin | Wicomico County | 1 | 312 |
| Tylerton | Somerset County | 1 | |
| Union Bridge | Carroll County | 1 | 890 |
| Unionville | Frederick County | 1 | |
| University Park | Prince Georges County | 1 | 2,559 |
| Upper Fairmount | Somerset County | 1 | |
| Upper Falls | Baltimore County | 1 | |
| Upper Marlboro | Prince Georges County | 1 | 672 |
| Upperco | Baltimore County | 1 | |
| Urbana | Frederick County | 2 | 8,965 |
| Vale Summit | Allegany County | 1 | 81 |
| Valley Lee | Saint Marys County | 1 | |
| Vienna | Dorchester County | 1 | 303 |
| Waldorf | Charles County | 3 | 68,947 |
| Walker Mill | Prince Georges County | 2 | 10,936 |
| Walkersville | Frederick County | 1 | 5,853 |
| Warwick | Cecil County | 1 | |
| Washington Grove | Montgomery County | 1 | 528 |
| Waterview | Wicomico County | 1 | 73 |
| West Denton | Caroline County | 1 | 196 |
| West Friendship | Howard County | 1 | |
| West Laurel | Prince Georges County | 1 | 4,536 |
| West Ocean City | Worcester County | 2 | 4,348 |
| West Pocomoke | Somerset County | 3 | 522 |
| West River | Anne Arundel County | 1 | |
| Westernport | Allegany County | 1 | 1,989 |
| Westminster | Carroll County | 2 | 18,614 |
| Westover | Somerset County | 1 | |
| Westphalia | Prince Georges County | 6 | 6,668 |
| Whaleyville | Worcester County | 1 | 137 |
| Wheaton | Montgomery County | 5 | 48,089 |
| White Hall | Baltimore County | 1 | |
| White Marsh | Baltimore County | 1 | 9,155 |
| White Oak | Montgomery County | 3 | 16,614 |
| White Plains | Charles County | 1 | |
| Whiteford | Harford County | 1 | |
| Whitehaven | Wicomico County | 1 | 129 |
| Wildewood | Saint Marys County | 2 | 6,691 |
| Willards | Wicomico County | 1 | 896 |
| Williamsport | Washington County | 1 | 2,364 |
| Williston | Caroline County | 1 | 142 |
| Wilson-Conococheague | Washington County | 3 | 2,656 |
| Windsor Mill | Baltimore County | 1 | |
| Wingate | Dorchester County | 1 | |
| Wittman | Talbot County | 1 | |
| Woodbine | Howard County | 1 | |
| Woodland | Allegany County | 1 | 163 |
| Woodlawn (Baltimore County) | Baltimore County | 5 | 39,216 |
| Woodlawn (Prince Georges County) | Prince Georges County | 2 | 6,678 |
| Woodmore | Prince Georges County | 1 | 3,491 |
| Woodsboro | Frederick County | 1 | 1,180 |
| Woodstock | Howard County | 1 | |
| Woolford | Dorchester County | 1 | |
| Worton | Kent County | 1 | 120 |
| Wye Mills | Queen Annes County | 1 | |
| Yarrowsburg | Washington County | 1 | 100 |
| Zihlman | Allegany County | 2 | 387 |