Iowa Voting-age Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the voting-age population of Iowa was 2.44M which was 76.65% of the total Iowa population. Among all Iowa counties, Polk had the highest voting-age population (367.04K), followed by Linn (175.27K), and Scott (132.62K).
On the other hand, the counties with the least voting-age population were: Adams (2.90K), Ringgold (3.59K), and Audubon (4.40K).
The chart and table below shows the voting-age population of each county and the percentage of each county's population that are of voting-age.
You can see similar information for other states and by state for the United States.
Related Topics: Iowa ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Iowa Voting-age Population By County in 2021
Iowa Voting-age Population By County in 2021
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| County | Voting-age Population | % of County Population |
|---|---|---|
| Adair | 5776 | 77.65 |
| Adams | 2903 | 78.52 |
| Allamakee | 10717 | 76.18 |
| Appanoose | 9494 | 77.12 |
| Audubon | 4398 | 77.74 |
| Benton | 19638 | 76.55 |
| Black Hawk | 102553 | 78.05 |
| Boone | 20941 | 78.37 |
| Bremer | 19162 | 77.07 |
| Buchanan | 15168 | 73.64 |
| Buena Vista | 15293 | 73.80 |
| Butler | 11098 | 76.96 |
| Calhoun | 7726 | 77.56 |
| Carroll | 15775 | 76.00 |
| Cass | 10160 | 77.22 |
| Cedar | 14402 | 77.87 |
| Cerro Gordo | 34099 | 78.96 |
| Cherokee | 8977 | 77.35 |
| Chickasaw | 9149 | 76.11 |
| Clarke | 7190 | 73.85 |
| Clay | 12563 | 76.56 |
| Clayton | 13442 | 78.27 |
| Clinton | 35944 | 77.15 |
| Crawford | 12345 | 74.57 |
| Dallas | 70059 | 72.52 |
| Davis | 6375 | 70.32 |
| Decatur | 6034 | 78.18 |
| Delaware | 13298 | 75.95 |
| Des Moines | 30161 | 77.20 |
| Dickinson | 14113 | 80.48 |
| Dubuque | 76069 | 77.08 |
| Emmet | 7498 | 79.49 |
| Fayette | 15399 | 78.64 |
| Floyd | 12081 | 77.09 |
| Franklin | 7697 | 76.54 |
| Fremont | 5174 | 77.20 |
| Greene | 6834 | 77.39 |
| Grundy | 9433 | 76.47 |
| Guthrie | 8243 | 77.77 |
| Hamilton | 11609 | 77.02 |
| Hancock | 8470 | 78.16 |
| Hardin | 13619 | 80.13 |
| Harrison | 11166 | 76.54 |
| Henry | 16055 | 78.36 |
| Howard | 7038 | 74.43 |
| Humboldt | 7314 | 76.01 |
| Ida | 5246 | 75.17 |
| Iowa | 12745 | 76.80 |
| Jackson | 15175 | 77.83 |
| Jasper | 29244 | 77.60 |
| Jefferson | 12640 | 79.77 |
| Johnson | 121459 | 80.00 |
| Jones | 16182 | 78.25 |
| Keokuk | 7728 | 76.90 |
| Kossuth | 11526 | 77.76 |
| Lee | 26423 | 78.35 |
| Linn | 175272 | 76.68 |
| Louisa | 8425 | 77.36 |
| Lucas | 6686 | 77.30 |
| Lyon | 8561 | 71.62 |
| Madison | 12235 | 74.54 |
| Mahaska | 16816 | 75.98 |
| Marion | 25552 | 76.55 |
| Marshall | 29880 | 74.44 |
| Mills | 11201 | 76.42 |
| Mitchell | 7989 | 75.90 |
| Monona | 6782 | 77.67 |
| Monroe | 5736 | 75.58 |
| Montgomery | 7812 | 75.65 |
| Muscatine | 32408 | 75.11 |
| O'Brien | 10734 | 75.92 |
| Osceola | 4706 | 76.30 |
| Page | 12209 | 80.06 |
| Palo Alto | 6865 | 76.31 |
| Plymouth | 19102 | 74.78 |
| Pocahontas | 5487 | 77.38 |
| Polk | 367044 | 75.08 |
| Pottawattamie | 71387 | 76.29 |
| Poweshiek | 14895 | 79.96 |
| Ringgold | 3590 | 75.75 |
| Sac | 7636 | 77.69 |
| Scott | 132618 | 76.14 |
| Shelby | 9164 | 77.99 |
| Sioux | 25888 | 72.62 |
| Story | 81790 | 83.37 |
| Tama | 12925 | 75.68 |
| Taylor | 4544 | 76.60 |
| Union | 9432 | 77.36 |
| Van Buren | 5525 | 76.78 |
| Wapello | 27122 | 76.74 |
| Warren | 39004 | 75.21 |
| Washington | 16909 | 75.07 |
| Wayne | 4820 | 74.11 |
| Webster | 29147 | 78.53 |
| Winnebago | 8361 | 77.83 |
| Winneshiek | 16360 | 81.39 |
| Woodbury | 77611 | 73.84 |
| Worth | 5908 | 79.30 |
| Wright | 9757 | 75.18 |
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