Iowa Citizen Voting-age Population By County in 2016 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2016, the citizen voting-age population for Iowa was 2,295,040 and represented 73.88% of the total Iowa population.
Among all Iowa counties, Polk had the highest citizen voting-age population (322.87K), followed by Linn (162.23K), and Scott (126.89K).
In terms of percentages, Dickinson had the highest percentage of its population being citizens of voting-age (80.05%), followed by Winneshiek (79.82%), and Audubon (79.38%).
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 | 322865 | 70.32 |
| Linn | 162225 | 74.39 |
| Scott | 126885 | 74.15 |
| Johnson | 104295 | 73.44 |
| Black Hawk | 101015 | 76.05 |
| Dubuque | 73010 | 75.77 |
| Story | 72440 | 76.39 |
| Woodbury | 70140 | 68.48 |
| Pottawattamie | 69240 | 74.29 |
| Dallas | 52795 | 67.62 |
| Clinton | 36530 | 76.15 |
| Warren | 35810 | 74.34 |
| Cerro Gordo | 33875 | 78.22 |
| Des Moines | 30600 | 76.28 |
| Muscatine | 30570 | 71.18 |
| Webster | 28460 | 76.82 |
| Jasper | 28435 | 77.45 |
| Lee | 27360 | 77.79 |
| Marshall | 26930 | 66.11 |
| Wapello | 25445 | 72.21 |
| Marion | 24975 | 75.24 |
| Sioux | 23750 | 68.60 |
| Boone | 20365 | 77.11 |
| Benton | 19320 | 75.12 |
| Bremer | 19005 | 77.05 |
| Plymouth | 18355 | 73.51 |
| Mahaska | 16875 | 75.59 |
| Winneshiek | 16595 | 79.82 |
| Washington | 16380 | 74.07 |
| Fayette | 15880 | 77.88 |
| Jones | 15845 | 77.37 |
| Carroll | 15510 | 75.46 |
| Buchanan | 15330 | 72.90 |
| Henry | 15210 | 76.28 |
| Jackson | 15130 | 77.47 |
| Poweshiek | 14435 | 77.52 |
| Cedar | 14075 | 76.54 |
| Clayton | 13680 | 77.14 |
| Dickinson | 13645 | 80.05 |
| Hardin | 13230 | 76.36 |
| Delaware | 13125 | 75.24 |
| Buena Vista | 13020 | 63.68 |
| Tama | 12845 | 73.72 |
| Clay | 12555 | 76.18 |
| Iowa | 12405 | 75.99 |
| Jefferson | 12350 | 69.93 |
| Floyd | 12170 | 76.04 |
| Page | 12065 | 77.59 |
| Kossuth | 11745 | 77.14 |
| Madison | 11455 | 73.15 |
| Butler | 11410 | 76.40 |
| Hamilton | 11385 | 74.78 |
| Mills | 11270 | 75.94 |
| Crawford | 11175 | 65.18 |
| Harrison | 11025 | 76.91 |
| O'Brien | 10545 | 75.03 |
| Allamakee | 10480 | 74.86 |
| Cass | 10395 | 77.37 |
| Appanoose | 9765 | 77.50 |
| Union | 9515 | 75.88 |
| Grundy | 9435 | 76.24 |
| Wright | 9365 | 72.65 |
| Cherokee | 9225 | 78.51 |
| Chickasaw | 9160 | 75.30 |
| Shelby | 9080 | 76.02 |
| Hancock | 8390 | 76.24 |
| Lyon | 8360 | 71.27 |
| Guthrie | 8190 | 76.61 |
| Winnebago | 8165 | 77.17 |
| Mitchell | 8095 | 75.27 |
| Montgomery | 7935 | 76.44 |
| Louisa | 7905 | 70.27 |
| Keokuk | 7840 | 76.60 |
| Calhoun | 7800 | 78.99 |
| Franklin | 7765 | 74.70 |
| Sac | 7715 | 76.88 |
| Emmet | 7495 | 76.32 |
| Humboldt | 7235 | 75.33 |
| Monona | 7150 | 79.31 |
| Howard | 7060 | 74.87 |
| Greene | 6930 | 76.28 |
| Palo Alto | 6930 | 75.70 |
| Clarke | 6635 | 71.54 |
| Lucas | 6560 | 75.40 |
| Decatur | 6350 | 77.35 |
| Davis | 6190 | 70.58 |
| Monroe | 5980 | 75.08 |
| Worth | 5920 | 78.31 |
| Adair | 5685 | 77.56 |
| Van Buren | 5635 | 76.36 |
| Fremont | 5440 | 77.49 |
| Pocahontas | 5395 | 76.42 |
| Ida | 5360 | 76.14 |
| Wayne | 4840 | 75.57 |
| Taylor | 4645 | 74.80 |
| Audubon | 4600 | 79.38 |
| Osceola | 4540 | 73.76 |
| Ringgold | 3820 | 75.57 |
| Adams | 3010 | 78.80 |
