Iowa Citizen Voting-age Population By County in 2017 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2017, the citizen voting-age population for Iowa was 2,302,495 and represented 73.84% of the total Iowa population.
Among all Iowa counties, Polk had the highest citizen voting-age population (328.74K), followed by Linn (163.17K), and Scott (127.25K).
In terms of percentages, Dickinson had the highest percentage of its population being citizens of voting-age (80.29%), followed by Winneshiek (79.71%), and Monona (79.64%).
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 | 328735 | 70.36 |
| Linn | 163170 | 74.17 |
| Scott | 127245 | 74.20 |
| Johnson | 105890 | 73.32 |
| Black Hawk | 100775 | 75.79 |
| Dubuque | 73020 | 75.61 |
| Story | 72970 | 76.10 |
| Woodbury | 70670 | 69.02 |
| Pottawattamie | 69140 | 74.12 |
| Dallas | 54705 | 67.65 |
| Warren | 36210 | 74.46 |
| Clinton | 36205 | 76.08 |
| Cerro Gordo | 33800 | 78.36 |
| Muscatine | 30665 | 71.44 |
| Des Moines | 30395 | 76.23 |
| Jasper | 28400 | 77.19 |
| Webster | 28360 | 76.76 |
| Lee | 27130 | 77.99 |
| Marshall | 26880 | 66.41 |
| Wapello | 25735 | 72.86 |
| Marion | 24990 | 75.44 |
| Sioux | 23755 | 68.48 |
| Boone | 20195 | 76.55 |
| Benton | 19385 | 75.59 |
| Bremer | 19030 | 76.92 |
| Plymouth | 18445 | 73.71 |
| Mahaska | 16735 | 75.05 |
| Winneshiek | 16400 | 79.71 |
| Washington | 16290 | 73.73 |
| Jones | 15880 | 77.58 |
| Fayette | 15690 | 77.91 |
| Buchanan | 15350 | 72.75 |
| Carroll | 15340 | 75.09 |
| Henry | 15195 | 76.49 |
| Jackson | 15030 | 77.43 |
| Poweshiek | 14385 | 78.05 |
| Cedar | 14180 | 77.19 |
| Clayton | 13695 | 77.33 |
| Dickinson | 13650 | 80.29 |
| Hardin | 13210 | 76.62 |
| Delaware | 13055 | 75.35 |
| Jefferson | 12815 | 71.41 |
| Buena Vista | 12715 | 62.42 |
| Tama | 12695 | 73.66 |
| Clay | 12485 | 76.20 |
| Iowa | 12320 | 75.91 |
| Page | 12120 | 78.73 |
| Floyd | 12115 | 76.17 |
| Kossuth | 11765 | 77.58 |
| Madison | 11540 | 73.41 |
| Hamilton | 11465 | 75.43 |
| Butler | 11355 | 76.62 |
| Mills | 11310 | 75.73 |
| Harrison | 10915 | 76.89 |
| Crawford | 10875 | 63.49 |
| O'Brien | 10445 | 74.90 |
| Allamakee | 10380 | 74.46 |
| Cass | 10285 | 77.19 |
| Appanoose | 9740 | 77.64 |
| Union | 9500 | 76.03 |
| Wright | 9425 | 73.26 |
| Grundy | 9420 | 76.24 |
| Chickasaw | 9150 | 75.37 |
| Cherokee | 9045 | 78.14 |
| Shelby | 8955 | 76.08 |
| Hancock | 8395 | 76.53 |
| Lyon | 8320 | 70.84 |
| Guthrie | 8185 | 76.75 |
| Winnebago | 8135 | 77.15 |
| Mitchell | 8055 | 75.53 |
| Louisa | 7885 | 70.15 |
| Keokuk | 7870 | 76.97 |
| Montgomery | 7770 | 75.88 |
| Calhoun | 7730 | 78.76 |
| Franklin | 7690 | 74.48 |
| Sac | 7645 | 76.95 |
| Emmet | 7265 | 75.21 |
| Humboldt | 7150 | 74.60 |
| Monona | 7060 | 79.64 |
| Howard | 6995 | 75.05 |
| Greene | 6890 | 76.18 |
| Palo Alto | 6845 | 75.14 |
| Clarke | 6625 | 71.51 |
| Lucas | 6480 | 75.35 |
| Decatur | 6250 | 77.11 |
| Davis | 6240 | 70.63 |
| Monroe | 5885 | 74.40 |
| Worth | 5840 | 77.87 |
| Adair | 5570 | 77.47 |
| Van Buren | 5550 | 75.92 |
| Fremont | 5380 | 77.02 |
| Pocahontas | 5330 | 76.47 |
| Ida | 5290 | 75.95 |
| Wayne | 4820 | 75.25 |
| Taylor | 4690 | 75.46 |
| Audubon | 4540 | 79.51 |
| Osceola | 4510 | 73.33 |
| Ringgold | 3790 | 76.03 |
| Adams | 2990 | 79.00 |
