Iowa Citizen Voting-age Population By County in 2015 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2015, the citizen voting-age population for Iowa was 2,285,125 and represented 73.87% of the total Iowa population.
Among all Iowa counties, Polk had the highest citizen voting-age population (317.49K), followed by Linn (161.09K), and Scott (126.14K).
In terms of percentages, Dickinson had the highest percentage of its population being citizens of voting-age (80.28%), followed by Winneshiek (79.46%), and Calhoun (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 | 317485 | 70.18 |
| Linn | 161085 | 74.36 |
| Scott | 126135 | 74.20 |
| Johnson | 102660 | 73.63 |
| Black Hawk | 101225 | 76.40 |
| Dubuque | 72615 | 75.72 |
| Story | 71530 | 76.43 |
| Woodbury | 70010 | 68.28 |
| Pottawattamie | 69275 | 74.32 |
| Dallas | 50730 | 67.74 |
| Clinton | 36690 | 75.86 |
| Warren | 35320 | 74.30 |
| Cerro Gordo | 34050 | 78.31 |
| Des Moines | 30620 | 76.15 |
| Muscatine | 30445 | 70.94 |
| Webster | 28670 | 76.87 |
| Jasper | 28425 | 77.40 |
| Lee | 27485 | 77.71 |
| Marshall | 27135 | 66.25 |
| Wapello | 25550 | 72.35 |
| Marion | 24890 | 74.86 |
| Sioux | 23845 | 69.10 |
| Boone | 20340 | 77.05 |
| Benton | 19285 | 74.73 |
| Bremer | 18965 | 77.28 |
| Plymouth | 18270 | 73.51 |
| Mahaska | 16855 | 75.26 |
| Winneshiek | 16595 | 79.46 |
| Washington | 16325 | 74.15 |
| Fayette | 16010 | 77.76 |
| Jones | 15910 | 77.38 |
| Carroll | 15550 | 75.38 |
| Buchanan | 15335 | 73.02 |
| Henry | 15275 | 76.07 |
| Jackson | 15135 | 77.34 |
| Poweshiek | 14515 | 77.60 |
| Cedar | 14025 | 76.33 |
| Clayton | 13685 | 76.86 |
| Dickinson | 13620 | 80.28 |
| Hardin | 13315 | 76.55 |
| Buena Vista | 13250 | 64.62 |
| Delaware | 13140 | 75.06 |
| Tama | 12925 | 73.94 |
| Clay | 12605 | 76.23 |
| Iowa | 12445 | 76.14 |
| Floyd | 12200 | 76.01 |
| Jefferson | 12140 | 70.09 |
| Page | 12055 | 76.98 |
| Kossuth | 11790 | 77.16 |
| Madison | 11425 | 73.03 |
| Hamilton | 11415 | 74.63 |
| Butler | 11360 | 75.91 |
| Mills | 11225 | 75.54 |
| Crawford | 11220 | 65.04 |
| Harrison | 11095 | 76.70 |
| O'Brien | 10575 | 75.05 |
| Cass | 10500 | 77.26 |
| Allamakee | 10495 | 74.64 |
| Appanoose | 9830 | 77.58 |
| Union | 9490 | 75.47 |
| Wright | 9460 | 73.14 |
| Grundy | 9405 | 75.82 |
| Cherokee | 9305 | 78.49 |
| Chickasaw | 9220 | 75.30 |
| Shelby | 9120 | 76.06 |
| Hancock | 8445 | 76.15 |
| Lyon | 8345 | 71.17 |
| Guthrie | 8250 | 76.82 |
| Winnebago | 8180 | 77.06 |
| Mitchell | 8090 | 75.19 |
| Montgomery | 7975 | 76.21 |
| Louisa | 7880 | 69.92 |
| Keokuk | 7875 | 76.53 |
| Calhoun | 7870 | 79.38 |
| Franklin | 7810 | 74.45 |
| Sac | 7805 | 77.28 |
| Emmet | 7485 | 75.49 |
| Humboldt | 7260 | 75.04 |
| Monona | 7190 | 79.10 |
| Howard | 7095 | 74.72 |
| Greene | 7010 | 76.40 |
| Palo Alto | 6995 | 75.95 |
| Clarke | 6620 | 71.34 |
| Lucas | 6530 | 74.80 |
| Decatur | 6365 | 77.15 |
| Davis | 6200 | 70.94 |
| Monroe | 5915 | 73.94 |
| Worth | 5895 | 77.93 |
| Adair | 5780 | 77.85 |
| Van Buren | 5685 | 76.51 |
| Fremont | 5520 | 77.69 |
| Pocahontas | 5450 | 76.49 |
| Ida | 5400 | 76.38 |
| Wayne | 4855 | 76.04 |
| Taylor | 4640 | 74.66 |
| Audubon | 4635 | 78.96 |
| Osceola | 4605 | 74.16 |
| Ringgold | 3840 | 75.89 |
| Adams | 3060 | 78.66 |
