Iowa Citizen Voting-age Population By County in 2020 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2020, the citizen voting-age population for Iowa was 2,331,655 and represented 74.02% of the total Iowa population.
Among all Iowa counties, Polk had the highest citizen voting-age population (343.40K), followed by Linn (167.97K), and Scott (128.51K).
In terms of percentages, Winneshiek had the highest percentage of its population being citizens of voting-age (80.26%), followed by Dickinson (79.69%), and Page (79.42%).
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 | 343400 | 70.74 |
| Linn | 167970 | 74.46 |
| Scott | 128505 | 74.31 |
| Johnson | 110135 | 73.02 |
| Black Hawk | 98620 | 74.82 |
| Story | 74510 | 76.53 |
| Dubuque | 73720 | 75.85 |
| Woodbury | 71630 | 69.76 |
| Pottawattamie | 69650 | 74.51 |
| Dallas | 62090 | 68.67 |
| Warren | 38095 | 74.89 |
| Clinton | 35795 | 76.59 |
| Cerro Gordo | 33490 | 78.49 |
| Muscatine | 30610 | 71.68 |
| Des Moines | 29885 | 76.19 |
| Jasper | 28355 | 76.57 |
| Webster | 27985 | 76.99 |
| Marshall | 26770 | 67.25 |
| Lee | 26430 | 77.86 |
| Wapello | 25725 | 73.29 |
| Marion | 25225 | 75.99 |
| Sioux | 24175 | 69.27 |
| Boone | 20525 | 77.81 |
| Benton | 19500 | 76.29 |
| Bremer | 19235 | 76.85 |
| Plymouth | 18330 | 72.91 |
| Mahaska | 16900 | 75.61 |
| Washington | 16125 | 72.96 |
| Winneshiek | 16125 | 80.26 |
| Jones | 16075 | 78.13 |
| Buchanan | 15435 | 73.01 |
| Henry | 15250 | 76.67 |
| Fayette | 15240 | 77.74 |
| Carroll | 15225 | 75.56 |
| Jackson | 15005 | 77.55 |
| Poweshiek | 14440 | 78.52 |
| Cedar | 14250 | 77.13 |
| Dickinson | 13755 | 79.69 |
| Clayton | 13600 | 77.60 |
| Hardin | 13085 | 77.31 |
| Delaware | 13010 | 76.06 |
| Jefferson | 12980 | 71.50 |
| Tama | 12465 | 73.50 |
| Iowa | 12380 | 76.63 |
| Clay | 12360 | 76.58 |
| Buena Vista | 12165 | 60.98 |
| Madison | 12155 | 75.26 |
| Floyd | 12110 | 77.06 |
| Page | 12075 | 79.42 |
| Kossuth | 11480 | 77.23 |
| Mills | 11410 | 75.94 |
| Hamilton | 11235 | 75.38 |
| Butler | 11165 | 76.95 |
| Crawford | 10965 | 64.50 |
| Harrison | 10835 | 77.15 |
| O'Brien | 10375 | 75.21 |
| Allamakee | 10270 | 74.64 |
| Cass | 10005 | 77.02 |
| Appanoose | 9640 | 77.37 |
| Union | 9445 | 76.76 |
| Grundy | 9390 | 76.59 |
| Wright | 9300 | 73.55 |
| Chickasaw | 9035 | 75.48 |
| Shelby | 8860 | 76.74 |
| Cherokee | 8830 | 78.28 |
| Lyon | 8305 | 70.38 |
| Hancock | 8265 | 77.17 |
| Guthrie | 8175 | 76.40 |
| Winnebago | 8115 | 77.47 |
| Mitchell | 8045 | 75.97 |
| Louisa | 7975 | 71.69 |
| Keokuk | 7770 | 76.44 |
| Montgomery | 7690 | 76.79 |
| Calhoun | 7540 | 78.09 |
| Sac | 7455 | 76.78 |
| Franklin | 7390 | 73.24 |
| Humboldt | 7110 | 74.69 |
| Emmet | 7100 | 76.18 |
| Monona | 6865 | 79.14 |
| Greene | 6855 | 76.81 |
| Howard | 6810 | 74.02 |
| Palo Alto | 6775 | 75.78 |
| Clarke | 6690 | 71.28 |
| Lucas | 6430 | 75.16 |
| Davis | 6330 | 70.53 |
| Decatur | 6065 | 76.68 |
| Monroe | 5945 | 76.61 |
| Worth | 5885 | 79.31 |
| Adair | 5470 | 77.59 |
| Van Buren | 5440 | 76.57 |
| Fremont | 5375 | 77.96 |
| Ida | 5140 | 74.93 |
| Pocahontas | 5135 | 76.36 |
| Wayne | 4755 | 74.01 |
| Taylor | 4565 | 74.11 |
| Osceola | 4435 | 73.73 |
| Audubon | 4365 | 78.93 |
| Ringgold | 3690 | 75.00 |
| Adams | 2875 | 79.09 |
