Partisan Voting Index for Counties in Iowa

This Map Displays the Partisan Voting Index Value for each county in Iowa. The Partisan Voting Index (PVI) is a measurement of how strongly a county leans toward the Democratic or Republican Party. The PVI is calculated by taking the average percentage for the winning party in a county for the last two elections and subtracting that value from the national average for that party in the same two elections. The data is based on results from the 2020 and 2016 presidential election. Of the 99 Counties in Iowa The County with the highest Republican PVI is Lyon County at +33. The County with the highest Democrat PVI is Johnson County at +21.

Map List Related

Map of Partisan Voting Index (PVI) for Counties in Iowa

Rep +20
Rep. 15-19
Rep. 10-14
Rep. 5-9
Rep. 1-4
Even
Dem 1-4
Dem 5-9
Dem 10-14
Dem 15-19
Dem +20

List of All Counties in Iowa With Partisan Voting Index (2020 Presidential Election Results)

Map KeyNamePartisan Voting Index (2020)
Adair CountyRepublican +18
Adams CountyRepublican +19
Allamakee CountyRepublican +12
Appanoose CountyRepublican +18
Audubon CountyRepublican +15
Benton CountyRepublican +11
Black Hawk CountyDemocrat +5
Boone CountyRepublican +5
Bremer CountyRepublican +5
Buchanan CountyRepublican +7
Buena Vista CountyRepublican +11
Butler CountyRepublican +17
Calhoun CountyRepublican +19
Carroll CountyRepublican +16
Cass CountyRepublican +18
Cedar CountyRepublican +7
Cerro Gordo CountyRepublican +2
Cherokee CountyRepublican +18
Chickasaw CountyRepublican +12
Clarke CountyRepublican +14
Clay CountyRepublican +19
Clayton CountyRepublican +11
Clinton CountyRepublican +2
Crawford CountyRepublican +18
Dallas CountyRepublican +1
Davis CountyRepublican +22
Decatur CountyRepublican +15
Delaware CountyRepublican +14
Des Moines CountyRepublican +2
Dickinson CountyRepublican +16
Dubuque CountyRepublican +1
Emmet CountyRepublican +17
Fayette CountyRepublican +9
Floyd CountyRepublican +7
Franklin CountyRepublican +16
Fremont CountyRepublican +19
Greene CountyRepublican +11
Grundy CountyRepublican +17
Guthrie CountyRepublican +15
Hamilton CountyRepublican +11
Hancock CountyRepublican +20
Hardin CountyRepublican +14
Harrison CountyRepublican +17
Henry CountyRepublican +14
Howard CountyRepublican +10
Humboldt CountyRepublican +21
Ida CountyRepublican +24
Iowa CountyRepublican +10
Jackson CountyRepublican +10
Jasper CountyRepublican +8
Jefferson CountyRepublican +2
Johnson CountyDemocrat +21
Jones CountyRepublican +8
Keokuk CountyRepublican +20
Kossuth CountyRepublican +18
Lee CountyRepublican +7
Linn CountyDemocrat +6
Louisa CountyRepublican +14
Lucas CountyRepublican +19
Lyon CountyRepublican +33
Madison CountyRepublican +14
Mahaska CountyRepublican +22
Marion CountyRepublican +14
Marshall CountyRepublican +2
Mills CountyRepublican +17
Mitchell CountyRepublican +11
Monona CountyRepublican +19
Monroe CountyRepublican +21
Montgomery CountyRepublican +19
Muscatine CountyRepublican +1
Obrien CountyRepublican +28
Osceola CountyRepublican +30
Page CountyRepublican +20
Palo Alto CountyRepublican +17
Plymouth CountyRepublican +24
Pocahontas CountyRepublican +22
Polk CountyDemocrat +8
Pottawattamie CountyRepublican +8
Poweshiek CountyRepublican +3
Ringgold CountyRepublican +20
Sac CountyRepublican +23
Scott CountyDemocrat +2
Shelby CountyRepublican +19
Sioux CountyRepublican +32
Story CountyDemocrat +7
Tama CountyRepublican +8
Taylor CountyRepublican +23
Union CountyRepublican +13
Van Buren CountyRepublican +24
Wapello CountyRepublican +10
Warren CountyRepublican +6
Washington CountyRepublican +8
Wayne CountyRepublican +23
Webster CountyRepublican +10
Winnebago CountyRepublican +11
Winneshiek CountyEven +0
Woodbury CountyRepublican +7
Worth CountyRepublican +10
Wright CountyRepublican +15

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