Iowa Census: County Populations
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| County | 2010 Population | 2000 Population | Percent Change |
|---|---|---|---|
| Adair | 7,682 | 8,243 | -6.8% |
| Adams | 4,029 | 4,482 | -10.1% |
| Allamakee | 14,330 | 14,675 | -2.4% |
| Appanoose | 12,887 | 13,721 | -6.1% |
| Audubon | 6,119 | 6,830 | -10.4% |
| Benton | 26,076 | 25,308 | 3.0% |
| Black Hawk | 131,090 | 128,012 | 2.4% |
| Boone | 26,306 | 26,224 | 0.3% |
| Bremer | 24,276 | 23,325 | 4.1% |
| Buchanan | 20,958 | 21,093 | -0.6% |
| Buena Vista | 20,260 | 20,411 | -0.7% |
| Butler | 14,867 | 15,305 | -2.9% |
| Calhoun | 9,670 | 11,115 | -13.0% |
| Carroll | 20,816 | 21,421 | -2.8% |
| Cass | 13,956 | 14,684 | -5.0% |
| Cedar | 18,499 | 18,187 | 1.7% |
| Cerro Gordo | 44,151 | 46,447 | -4.9% |
| Cherokee | 12,072 | 13,035 | -7.4% |
| Chickasaw | 12,439 | 13,095 | -5.0% |
| Clarke | 9,286 | 9,133 | 1.7% |
| Clay | 16,667 | 17,372 | -4.1% |
| Clayton | 18,129 | 18,678 | -2.9% |
| Clinton | 49,116 | 50,149 | -2.1% |
| Crawford | 17,096 | 16,942 | 0.9% |
| Dallas | 66,135 | 40,750 | 62.3% |
| Davis | 8,753 | 8,541 | 2.5% |
| Decatur | 8,457 | 8,689 | -2.7% |
| Delaware | 17,764 | 18,404 | -3.5% |
| Des Moines | 40,325 | 42,351 | -4.8% |
| Dickinson | 16,667 | 16,424 | 1.5% |
| Dubuque | 93,653 | 89,143 | 5.1% |
| Emmet | 10,302 | 11,027 | -6.6% |
| Fayette | 20,880 | 22,008 | -5.1% |
| Floyd | 16,303 | 16,900 | -3.5% |
| Franklin | 10,680 | 10,704 | -0.2% |
| Fremont | 7,441 | 8,010 | -7.1% |
| Greene | 9,336 | 10,366 | -9.9% |
| Grundy | 12,453 | 12,369 | 0.7% |
| Guthrie | 10,954 | 11,353 | -3.5% |
| Hamilton | 15,673 | 16,438 | -4.7% |
| Hancock | 11,341 | 12,100 | -6.3% |
| Hardin | 17,534 | 18,812 | -6.8% |
| Harrison | 14,928 | 15,666 | -4.7% |
| Henry | 20,145 | 20,336 | -0.9% |
| Howard | 9,566 | 9,932 | -3.7% |
| Humboldt | 9,815 | 10,381 | -5.5% |
| Ida | 7,089 | 7,837 | -9.5% |
| Iowa | 16,355 | 15,671 | 4.4% |
| Jackson | 19,848 | 20,296 | -2.2% |
| Jasper | 36,842 | 37,213 | -1.0% |
| Jefferson | 16,843 | 16,181 | 4.1% |
| Johnson | 130,882 | 111,006 | 17.9% |
| Jones | 20,638 | 20,221 | 2.1% |
| Keokuk | 10,511 | 11,400 | -7.8% |
| Kossuth | 15,543 | 17,163 | -9.4% |
| Lee | 35,862 | 38,052 | -5.8% |
| Linn | 211,226 | 191,701 | 10.2% |
| Louisa | 11,387 | 12,183 | -6.5% |
| Lucas | 8,898 | 9,422 | -5.6% |
| Lyon | 11,581 | 11,763 | -1.5% |
| Madison | 15,679 | 14,019 | 11.8% |
| Mahaska | 22,381 | 22,335 | 0.2% |
| Marion | 33,309 | 32,052 | 3.9% |
| Marshall | 40,648 | 39,311 | 3.4% |
| Mills | 15,059 | 14,547 | 3.5% |
| Mitchell | 10,776 | 10,874 | -0.9% |
| Monona | 9,243 | 10,020 | -7.8% |
| Monroe | 7,970 | 8,016 | -0.6% |
| Montgomery | 10,740 | 11,771 | -8.8% |
| Muscatine | 42,745 | 41,722 | 2.5% |
| O'Brien | 14,398 | 15,102 | -4.7% |
| Osceola | 6,462 | 7,003 | -7.7% |
| Page | 15,932 | 16,976 | -6.1% |
| Palo Alto | 9,421 | 10,147 | -7.2% |
| Plymouth | 24,986 | 24,849 | 0.6% |
| Pocahontas | 7,310 | 8,662 | -15.6% |
| Polk | 430,640 | 374,601 | 15.0% |
| Pottawattamie | 93,158 | 87,704 | 6.2% |
| Poweshiek | 18,914 | 18,815 | 0.5% |
| Ringgold | 5,131 | 5,469 | -6.2% |
| Sac | 10,350 | 11,529 | -10.2% |
| Scott | 165,224 | 158,668 | 4.1% |
| Shelby | 12,167 | 13,173 | -7.6% |
| Sioux | 33,704 | 31,589 | 6.7% |
| Story | 89,542 | 79,981 | 12.0% |
| Tama | 17,767 | 18,103 | -1.9% |
| Taylor | 6,317 | 6,958 | -9.2% |
| Union | 12,534 | 12,309 | 1.8% |
| Van Buren | 7,570 | 7,809 | -3.1% |
| Wapello | 35,625 | 36,051 | -1.2% |
| Warren | 46,225 | 40,671 | 13.7% |
| Washington | 21,704 | 20,670 | 5.0% |
| Wayne | 6,403 | 6,730 | -4.9% |
| Webster | 38,013 | 40,235 | -5.5% |
| Winnebago | 10,866 | 11,723 | -7.3% |
| Winneshiek | 21,056 | 21,310 | -1.2% |
| Woodbury | 102,172 | 103,877 | -1.6% |
| Worth | 7,598 | 7,909 | -3.9% |
| Wright | 13,229 | 14,334 | -7.7% |