Ranking of Iowa Counties By Voting-age Population Percentage from Census 2020
Updated on August 22, 2023.
According to the data from the US 2020 Census, as at April 2020, Story County had the highest voting-age population percentage in Iowa (83.25%), followed by Jefferson County (81.24%), and Dickinson County (80.96%).
The chart below shows the top 10 counties with high voting-age population percentage, and the table below shows the ranking of all Iowa counties based on the percentage of the population that were in the voting-age (18 years and over) group.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: Iowa Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Iowa Counties By Voting-age Population Percentage from Census 2020
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| Rank | County | % of County Voting-age Population |
|---|---|---|
| 1 | Story County | 83.25 |
| 2 | Jefferson County | 81.24 |
| 3 | Dickinson County | 80.96 |
| 4 | Winneshiek County | 80.75 |
| 5 | Poweshiek County | 80.58 |
| 6 | Johnson County | 79.87 |
| 7 | Cerro Gordo County | 79.83 |
| 8 | Winnebago County | 79.34 |
| 9 | Page County | 79.03 |
| 10 | Henry County | 78.93 |
| 10 | Webster County | 78.93 |
| 11 | Lee County | 78.67 |
| 12 | Jones County | 78.65 |
| 13 | Calhoun County | 78.63 |
| 14 | Kossuth County | 78.59 |
| 15 | Fayette County | 78.48 |
| 16 | Cherokee County | 78.33 |
| 17 | Jackson County | 78.29 |
| 18 | Clayton County | 78.27 |
| 19 | Des Moines County | 78.24 |
| 20 | Audubon County | 78.20 |
| 21 | Black Hawk County | 78.18 |
| 22 | Emmet County | 78.08 |
| 23 | Adams County | 78.05 |
| 23 | Montgomery County | 78.05 |
| 24 | Appanoose County | 78.01 |
| 25 | Cass County | 77.97 |
| 26 | Monona County | 77.96 |
| 27 | Jasper County | 77.87 |
| 28 | Hancock County | 77.86 |
| 29 | Adair County | 77.83 |
| 30 | Greene County | 77.73 |
| 31 | Ringgold County | 77.70 |
| 32 | Butler County | 77.63 |
| 33 | Sac County | 77.58 |
| 34 | Clay County | 77.54 |
| 34 | Shelby County | 77.54 |
| 35 | Fremont County | 77.53 |
| 36 | Dubuque County | 77.49 |
| 36 | Guthrie County | 77.49 |
| 36 | Palo Alto County | 77.49 |
| 37 | Hardin County | 77.41 |
| 38 | Worth County | 77.39 |
| 39 | Pocahontas County | 77.32 |
| 40 | Louisa County | 77.25 |
| 41 | Clinton County | 77.24 |
| 42 | Osceola County | 77.23 |
| 43 | Cedar County | 77.19 |
| 44 | Union County | 77.12 |
| 45 | Ida County | 77.07 |
| 46 | Hamilton County | 76.89 |
| 47 | Boone County | 76.86 |
| 48 | Decatur County | 76.82 |
| 48 | Linn County | 76.82 |
| 49 | O'Brien County | 76.75 |
| 50 | Allamakee County | 76.68 |
| 51 | Marion County | 76.67 |
| 51 | Pottawattamie County | 76.67 |
| 52 | Iowa County | 76.60 |
| 52 | Lucas County | 76.60 |
| 53 | Floyd County | 76.59 |
| 53 | Harrison County | 76.59 |
| 53 | Taylor County | 76.59 |
| 54 | Bremer County | 76.58 |
| 55 | Scott County | 76.56 |
| 56 | Franklin County | 76.54 |
| 57 | Mitchell County | 76.53 |
| 58 | Monroe County | 76.50 |
| 59 | Chickasaw County | 76.45 |
| 60 | Delaware County | 76.39 |
| 61 | Mahaska County | 76.31 |
| 62 | Keokuk County | 76.29 |
| 63 | Grundy County | 76.19 |
| 64 | Van Buren County | 76.15 |
| 65 | Benton County | 76.08 |
| 66 | Wapello County | 76.02 |
| 67 | Carroll County | 76.01 |
| 68 | Tama County | 75.81 |
| 69 | Muscatine County | 75.79 |
| 70 | Humboldt County | 75.71 |
| 71 | Washington County | 75.66 |
| 72 | Polk County | 75.48 |
| 73 | Mills County | 75.43 |
| 74 | Clarke County | 75.22 |
| 75 | Wright County | 75.20 |
| 76 | Howard County | 74.91 |
| 77 | Marshall County | 74.85 |
| 78 | Plymouth County | 74.77 |
| 79 | Warren County | 74.58 |
| 80 | Madison County | 74.46 |
| 81 | Woodbury County | 73.99 |
| 82 | Wayne County | 73.76 |
| 83 | Buchanan County | 73.67 |
| 84 | Buena Vista County | 73.61 |
| 85 | Crawford County | 73.22 |
| 86 | Dallas County | 72.28 |
| 87 | Sioux County | 72.09 |
| 88 | Lyon County | 71.12 |
| 89 | Davis County | 70.08 |