Iowa Citizen Voting-age Population By County in 2018 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen voting-age population for Iowa was 2,312,665 and represented 73.83% of the total Iowa population.
Among all Iowa counties, Polk had the highest citizen voting-age population (333.65K), followed by Linn (164.92K), and Scott (127.52K).
In terms of percentages, Audubon had the highest percentage of its population being citizens of voting-age (80.21%), followed by Dickinson (80.06%), and Winneshiek (79.93%).
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 | 333650 | 70.35 |
| Linn | 164915 | 74.25 |
| Scott | 127520 | 74.02 |
| Johnson | 107000 | 72.79 |
| Black Hawk | 100375 | 75.46 |
| Story | 73670 | 76.01 |
| Dubuque | 73235 | 75.66 |
| Woodbury | 71230 | 69.56 |
| Pottawattamie | 69205 | 74.01 |
| Dallas | 57045 | 67.91 |
| Warren | 36785 | 74.52 |
| Clinton | 35980 | 76.20 |
| Cerro Gordo | 33650 | 78.28 |
| Muscatine | 30835 | 71.79 |
| Des Moines | 30195 | 76.25 |
| Jasper | 28415 | 77.03 |
| Webster | 28295 | 76.98 |
| Lee | 26875 | 77.81 |
| Marshall | 26670 | 66.23 |
| Wapello | 25690 | 72.75 |
| Marion | 25150 | 75.74 |
| Sioux | 23960 | 68.80 |
| Boone | 20445 | 77.44 |
| Benton | 19465 | 75.96 |
| Bremer | 19020 | 76.76 |
| Plymouth | 18385 | 73.42 |
| Mahaska | 16715 | 75.26 |
| Winneshiek | 16305 | 79.93 |
| Washington | 16285 | 73.54 |
| Jones | 15920 | 77.39 |
| Fayette | 15605 | 78.30 |
| Buchanan | 15375 | 72.78 |
| Carroll | 15310 | 75.25 |
| Henry | 15250 | 76.54 |
| Jackson | 15010 | 77.39 |
| Poweshiek | 14585 | 78.39 |
| Cedar | 14190 | 76.93 |
| Clayton | 13675 | 77.39 |
| Dickinson | 13655 | 80.06 |
| Hardin | 13230 | 77.26 |
| Delaware | 13090 | 75.84 |
| Jefferson | 13080 | 72.36 |
| Buena Vista | 12665 | 62.51 |
| Tama | 12605 | 73.56 |
| Iowa | 12390 | 76.46 |
| Clay | 12385 | 75.91 |
| Floyd | 12090 | 76.23 |
| Page | 12090 | 78.69 |
| Madison | 11705 | 73.66 |
| Kossuth | 11700 | 77.61 |
| Hamilton | 11380 | 75.31 |
| Mills | 11310 | 75.63 |
| Butler | 11285 | 76.59 |
| Harrison | 10865 | 76.81 |
| Crawford | 10765 | 62.84 |
| O'Brien | 10410 | 74.84 |
| Allamakee | 10295 | 74.17 |
| Cass | 10150 | 76.95 |
| Appanoose | 9700 | 77.54 |
| Union | 9510 | 76.36 |
| Grundy | 9430 | 76.42 |
| Wright | 9380 | 73.25 |
| Chickasaw | 9105 | 75.25 |
| Cherokee | 9005 | 78.51 |
| Shelby | 8945 | 76.49 |
| Hancock | 8370 | 76.86 |
| Lyon | 8315 | 70.65 |
| Guthrie | 8165 | 76.49 |
| Winnebago | 8165 | 77.25 |
| Mitchell | 8085 | 76.06 |
| Louisa | 7895 | 70.33 |
| Keokuk | 7835 | 76.81 |
| Calhoun | 7725 | 78.99 |
| Montgomery | 7665 | 75.48 |
| Franklin | 7655 | 74.72 |
| Sac | 7595 | 76.95 |
| Emmet | 7280 | 76.23 |
| Humboldt | 7150 | 74.75 |
| Monona | 6965 | 79.19 |
| Howard | 6930 | 74.80 |
| Greene | 6830 | 75.85 |
| Palo Alto | 6790 | 74.99 |
| Clarke | 6505 | 70.10 |
| Lucas | 6430 | 74.81 |
| Davis | 6265 | 70.51 |
| Decatur | 6175 | 76.76 |
| Monroe | 5885 | 74.83 |
| Worth | 5865 | 78.30 |
| Adair | 5500 | 77.19 |
| Van Buren | 5485 | 75.92 |
| Fremont | 5380 | 77.19 |
| Pocahontas | 5290 | 76.67 |
| Ida | 5250 | 75.92 |
| Wayne | 4800 | 74.83 |
| Taylor | 4610 | 74.36 |
| Audubon | 4520 | 80.21 |
| Osceola | 4460 | 72.94 |
| Ringgold | 3755 | 75.33 |
| Adams | 2935 | 78.79 |
