Iowa Citizen Voting-age Population By County in 2021 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen voting-age population for Iowa was 2,348,190 and represented 73.86% of the total Iowa population.
Among all Iowa counties, Polk had the highest citizen voting-age population (345.31K), followed by Linn (169.85K), and Scott (129.64K).
In terms of percentages, Winneshiek had the highest percentage of its population being citizens of voting-age (80.03%), followed by Page (79.28%), and Worth (78.93%).
The chart and table below shows the citizen voting-age population of each county and the percentage of each county's population that were citizens of voting-age.
You can see similar information for other states and by state for the United States.
| County | Citizen Voting-age Population | % of County Population |
|---|---|---|
| Polk | 345310 | 70.63 |
| Linn | 169845 | 74.31 |
| Scott | 129635 | 74.43 |
| Johnson | 111300 | 73.30 |
| Black Hawk | 98225 | 74.76 |
| Story | 75885 | 77.35 |
| Dubuque | 74625 | 75.62 |
| Woodbury | 72805 | 69.27 |
| Pottawattamie | 69480 | 74.26 |
| Dallas | 66485 | 68.82 |
| Warren | 38750 | 74.72 |
| Clinton | 35615 | 76.44 |
| Cerro Gordo | 33775 | 78.21 |
| Muscatine | 30875 | 71.56 |
| Des Moines | 29725 | 76.08 |
| Jasper | 28815 | 76.46 |
| Webster | 28405 | 76.53 |
| Marshall | 27080 | 67.47 |
| Lee | 26230 | 77.78 |
| Wapello | 25815 | 73.04 |
| Marion | 25290 | 75.76 |
| Sioux | 24725 | 69.36 |
| Boone | 20765 | 77.71 |
| Benton | 19570 | 76.28 |
| Bremer | 19000 | 76.41 |
| Plymouth | 18580 | 72.73 |
| Mahaska | 16665 | 75.31 |
| Washington | 16520 | 73.34 |
| Jones | 16130 | 78.00 |
| Winneshiek | 16085 | 80.03 |
| Henry | 15715 | 76.70 |
| Carroll | 15580 | 75.07 |
| Fayette | 15155 | 77.40 |
| Jackson | 15100 | 77.44 |
| Buchanan | 15025 | 72.94 |
| Poweshiek | 14565 | 78.18 |
| Cedar | 14240 | 76.99 |
| Dickinson | 13825 | 78.84 |
| Hardin | 13335 | 78.46 |
| Clayton | 13315 | 77.53 |
| Delaware | 13280 | 75.84 |
| Buena Vista | 12820 | 61.86 |
| Iowa | 12670 | 76.35 |
| Clay | 12475 | 76.02 |
| Tama | 12410 | 72.66 |
| Madison | 12195 | 74.29 |
| Page | 12090 | 79.28 |
| Floyd | 12040 | 76.83 |
| Kossuth | 11375 | 76.73 |
| Hamilton | 11330 | 75.16 |
| Jefferson | 11290 | 71.25 |
| Harrison | 11125 | 76.25 |
| Mills | 11090 | 75.65 |
| Butler | 10985 | 76.18 |
| Crawford | 10615 | 64.12 |
| O'Brien | 10570 | 74.75 |
| Allamakee | 10380 | 73.77 |
| Cass | 9985 | 75.87 |
| Wright | 9470 | 72.96 |
| Appanoose | 9430 | 76.60 |
| Grundy | 9355 | 75.84 |
| Union | 9250 | 75.85 |
| Chickasaw | 9075 | 75.50 |
| Shelby | 9005 | 76.64 |
| Cherokee | 8960 | 77.21 |
| Lyon | 8425 | 70.47 |
| Hancock | 8370 | 77.25 |
| Winnebago | 8260 | 76.87 |
| Guthrie | 8110 | 76.51 |
| Mitchell | 7900 | 75.06 |
| Montgomery | 7800 | 75.55 |
| Louisa | 7755 | 71.21 |
| Calhoun | 7680 | 77.11 |
| Keokuk | 7665 | 76.27 |
| Sac | 7560 | 76.91 |
| Franklin | 7280 | 72.40 |
| Emmet | 7195 | 76.26 |
| Humboldt | 7130 | 74.12 |
| Howard | 6950 | 73.51 |
| Clarke | 6825 | 70.11 |
| Greene | 6790 | 76.90 |
| Monona | 6775 | 77.61 |
| Palo Alto | 6760 | 75.15 |
| Lucas | 6540 | 75.61 |
| Davis | 6340 | 69.94 |
| Decatur | 5905 | 76.49 |
| Worth | 5880 | 78.93 |
| Monroe | 5735 | 75.56 |
| Adair | 5720 | 76.88 |
| Van Buren | 5495 | 76.37 |
| Pocahontas | 5370 | 75.74 |
| Ida | 5190 | 74.36 |
| Fremont | 5155 | 76.94 |
| Wayne | 4790 | 73.64 |
| Osceola | 4535 | 73.50 |
| Audubon | 4360 | 77.10 |
| Taylor | 4355 | 73.44 |
| Ringgold | 3570 | 75.32 |
| Adams | 2900 | 78.48 |
