Iowa Citizen Population By County in 2024 (ACS-5Yrs)
Updated on March 28, 2026.
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2024, the citizen population for Iowa was 3,104,036 and represented 96.68% of the total Iowa population.
Among all Iowa counties, Polk had the highest citizen population (476.14K), followed by Linn (224.17K), and Scott (170.82K).
In terms of percentages, Monona had the highest percentage of its population being citizens (99.94%), followed by Floyd (99.90%), and Adams (99.78%).
The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.
You can see similar information for other states and by state for the United States.
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Data Source: US Census - ACS 5-Year (CVAP).
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Iowa Citizen Population By County in 2024
Iowa Citizen Population By County in 2024
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| County | Citizen Population | % of County Population |
|---|---|---|
| Polk | 476139 | 94.63 |
| Linn | 224174 | 97.47 |
| Scott | 170820 | 97.83 |
| Johnson | 148469 | 94.78 |
| Black Hawk | 126386 | 96.44 |
| Dallas | 102344 | 94.79 |
| Woodbury | 99478 | 93.63 |
| Dubuque | 96956 | 97.91 |
| Story | 94860 | 94.42 |
| Pottawattamie | 91317 | 97.74 |
| Warren | 54045 | 99.34 |
| Clinton | 45972 | 99.36 |
| Cerro Gordo | 41994 | 98.50 |
| Muscatine | 40968 | 96.26 |
| Des Moines | 37898 | 98.48 |
| Jasper | 37080 | 97.69 |
| Marshall | 36349 | 90.62 |
| Webster | 35983 | 97.55 |
| Sioux | 34257 | 94.61 |
| Marion | 33381 | 99.22 |
| Wapello | 33163 | 93.78 |
| Lee | 32588 | 99.07 |
| Boone | 26576 | 99.66 |
| Benton | 25648 | 99.69 |
| Plymouth | 25208 | 97.90 |
| Bremer | 25103 | 99.60 |
| Washington | 22148 | 98.18 |
| Mahaska | 21774 | 98.87 |
| Jones | 20666 | 98.90 |
| Buchanan | 20507 | 99.09 |
| Carroll | 20427 | 99.19 |
| Henry | 19787 | 98.90 |
| Winneshiek | 19461 | 97.94 |
| Jackson | 19281 | 99.44 |
| Fayette | 18965 | 98.32 |
| Cedar | 18283 | 99.65 |
| Poweshiek | 18033 | 97.23 |
| Dickinson | 17835 | 99.13 |
| Buena Vista | 17822 | 85.87 |
| Delaware | 17503 | 99.68 |
| Madison | 16870 | 99.68 |
| Clayton | 16856 | 99.07 |
| Iowa | 16437 | 99.58 |
| Tama | 16401 | 97.23 |
| Hardin | 16237 | 97.59 |
| Clay | 16168 | 98.23 |
| Floyd | 15311 | 99.90 |
| Page | 15026 | 99.33 |
| Crawford | 14714 | 90.40 |
| Harrison | 14566 | 99.53 |
| Mills | 14519 | 99.64 |
| Kossuth | 14133 | 97.36 |
| Hamilton | 14131 | 94.95 |
| Butler | 14096 | 98.80 |
| Jefferson | 13947 | 88.80 |
| O'Brien | 13696 | 96.94 |
| Allamakee | 13399 | 95.11 |
| Cass | 13000 | 99.25 |
| Grundy | 12227 | 98.73 |
| Appanoose | 12079 | 99.13 |
| Wright | 12071 | 94.37 |
| Lyon | 12026 | 98.91 |
| Union | 11817 | 98.55 |
| Shelby | 11641 | 98.85 |
| Chickasaw | 11472 | 97.15 |
| Cherokee | 11373 | 98.05 |
| Guthrie | 10558 | 98.77 |
| Hancock | 10523 | 98.61 |
| Mitchell | 10472 | 99.04 |
| Winnebago | 10319 | 97.53 |
| Montgomery | 10169 | 99.58 |
| Louisa | 10034 | 93.97 |
| Keokuk | 9870 | 99.46 |
| Calhoun | 9727 | 99.20 |
| Sac | 9537 | 98.43 |
| Clarke | 9402 | 97.29 |
| Howard | 9327 | 98.74 |
| Humboldt | 9257 | 96.52 |
| Franklin | 9256 | 92.99 |
| Emmet | 9108 | 98.33 |
| Davis | 9059 | 98.93 |
| Palo Alto | 8771 | 98.98 |
| Greene | 8625 | 99.30 |
| Monona | 8552 | 99.94 |
| Lucas | 8493 | 97.41 |
| Decatur | 7648 | 98.56 |
| Monroe | 7488 | 99.65 |
| Adair | 7414 | 99.37 |
| Worth | 7300 | 99.32 |
| Van Buren | 7218 | 99.68 |
| Pocahontas | 6910 | 98.08 |
| Ida | 6792 | 98.26 |
| Wayne | 6492 | 99.39 |
| Fremont | 6447 | 99.00 |
| Osceola | 5887 | 96.54 |
| Taylor | 5755 | 98.04 |
| Audubon | 5543 | 99.00 |
| Ringgold | 4626 | 99.55 |
| Adams | 3614 | 99.78 |
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