Ranking of Iowa Counties By Total Voting-age Population (18yrs and over) from Census 2020
Updated on August 22, 2023.
According to the data from the US 2020 Census, as at April 2020, among all the counties in Iowa, Polk County had the highest voting-age population (18 years and over) (371.66K), followed by Linn County (176.91K), and Scott County (133.73K).
The chart below shows the top 10 counties with high voting-age population, and the table below shows the ranking of all Iowa counties based on voting-age population.
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 Total Voting-age Population from Census 2020
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| Rank | County | Voting-age Population |
|---|---|---|
| 1 | Polk County | 371655 |
| 2 | Linn County | 176911 |
| 3 | Scott County | 133731 |
| 4 | Johnson County | 122084 |
| 5 | Black Hawk County | 102527 |
| 6 | Story County | 82031 |
| 7 | Woodbury County | 78384 |
| 8 | Dubuque County | 76916 |
| 9 | Dallas County | 72050 |
| 10 | Pottawattamie County | 71810 |
| 11 | Warren County | 39080 |
| 12 | Clinton County | 35887 |
| 13 | Cerro Gordo County | 34430 |
| 14 | Muscatine County | 32767 |
| 15 | Des Moines County | 30442 |
| 16 | Marshall County | 30017 |
| 17 | Jasper County | 29446 |
| 18 | Webster County | 29204 |
| 19 | Wapello County | 26940 |
| 20 | Lee County | 26398 |
| 21 | Sioux County | 25861 |
| 22 | Marion County | 25620 |
| 23 | Boone County | 20533 |
| 24 | Benton County | 19458 |
| 25 | Plymouth County | 19215 |
| 26 | Bremer County | 19135 |
| 27 | Washington County | 17073 |
| 28 | Mahaska County | 16933 |
| 29 | Jones County | 16239 |
| 30 | Winneshiek County | 16206 |
| 31 | Henry County | 16167 |
| 32 | Carroll County | 15779 |
| 33 | Buena Vista County | 15327 |
| 34 | Fayette County | 15310 |
| 35 | Jackson County | 15254 |
| 36 | Buchanan County | 15150 |
| 37 | Poweshiek County | 15037 |
| 38 | Dickinson County | 14332 |
| 39 | Cedar County | 14283 |
| 40 | Delaware County | 13359 |
| 41 | Clayton County | 13339 |
| 42 | Hardin County | 13066 |
| 43 | Tama County | 12990 |
| 44 | Iowa County | 12763 |
| 45 | Jefferson County | 12724 |
| 46 | Clay County | 12704 |
| 47 | Madison County | 12321 |
| 48 | Crawford County | 12099 |
| 49 | Page County | 12021 |
| 50 | Floyd County | 11969 |
| 51 | Kossuth County | 11653 |
| 52 | Hamilton County | 11564 |
| 53 | Harrison County | 11168 |
| 54 | Butler County | 11127 |
| 55 | Mills County | 10925 |
| 56 | O'Brien County | 10884 |
| 57 | Allamakee County | 10782 |
| 58 | Cass County | 10235 |
| 59 | Wright County | 9733 |
| 60 | Appanoose County | 9608 |
| 61 | Grundy County | 9393 |
| 62 | Union County | 9361 |
| 63 | Chickasaw County | 9183 |
| 64 | Cherokee County | 9132 |
| 65 | Shelby County | 9108 |
| 66 | Lyon County | 8487 |
| 67 | Winnebago County | 8473 |
| 68 | Hancock County | 8405 |
| 69 | Louisa County | 8372 |
| 70 | Guthrie County | 8232 |
| 71 | Mitchell County | 8085 |
| 72 | Montgomery County | 8062 |
| 73 | Calhoun County | 7806 |
| 74 | Franklin County | 7668 |
| 75 | Keokuk County | 7654 |
| 76 | Sac County | 7614 |
| 77 | Clarke County | 7332 |
| 78 | Emmet County | 7330 |
| 79 | Humboldt County | 7266 |
| 80 | Howard County | 7093 |
| 81 | Palo Alto County | 6971 |
| 82 | Monona County | 6822 |
| 83 | Greene County | 6818 |
| 84 | Lucas County | 6614 |
| 85 | Davis County | 6384 |
| 86 | Decatur County | 5873 |
| 87 | Adair County | 5834 |
| 88 | Monroe County | 5796 |
| 89 | Worth County | 5760 |
| 90 | Van Buren County | 5485 |
| 91 | Pocahontas County | 5473 |
| 92 | Ida County | 5399 |
| 93 | Fremont County | 5121 |
| 94 | Wayne County | 4792 |
| 95 | Osceola County | 4782 |
| 96 | Taylor County | 4516 |
| 97 | Audubon County | 4437 |
| 98 | Ringgold County | 3623 |
| 99 | Adams County | 2891 |