Map of County wise Population of Iowa
The Population of Iowa, which has 99 Counties, as per July 1st, 2016 estimate, is 3,134,693 (Three million one hundred thirty-four thousand six hundred ninety-three). The last official US Government census was done in 2010, and the population as per that census was 3,046,355 (Three million forty-six thousand three hundred fifty-five). Here is a compilation of county-wise population data for the state in tabular format:
| Iowa Population by County | ||
| County Name | April 1, 2010 – Census | Population Estimate (as of July 1, 2016) |
| Polk County | 430,640 | 474,045 |
| Linn County | 211,226 | 221,661 |
| Scott County | 165,224 | 172,474 |
| Johnson County | 130,882 | 146,547 |
| Black Hawk County | 131,090 | 132,904 |
| Woodbury County | 102,172 | 102,779 |
| Story County | 89,542 | 97,090 |
| Dubuque County | 93,653 | 97,003 |
| Pottawattamie County | 93,158 | 93,582 |
| Dallas County | 66,135 | 84,516 |
| Warren County | 46,225 | 49,691 |
| Clinton County | 49,116 | 47,309 |
| Cerro Gordo County | 44,151 | 43,070 |
| Muscatine County | 42,745 | 42,940 |
| Marshall County | 40,648 | 40,312 |
| Des Moines County | 40,325 | 39,739 |
| Webster County | 38,013 | 36,769 |
| Jasper County | 36,842 | 36,708 |
| Wapello County | 35,625 | 34,982 |
| Sioux County | 33,704 | 34,898 |
| Lee County | 35,862 | 34,615 |
| Marion County | 33,309 | 33,189 |
| Boone County | 26,306 | 26,532 |
| Benton County | 26,076 | 25,699 |
| Plymouth County | 24,986 | 25,200 |
| Bremer County | 24,276 | 24,798 |
| Washington County | 21,704 | 22,281 |
| Mahaska County | 22,381 | 22,181 |
| Buchanan County | 20,958 | 20,992 |
| Winneshiek County | 21,056 | 20,561 |
| Jones County | 20,638 | 20,439 |
| Carroll County | 20,816 | 20,437 |
| Buena Vista County | 20,260 | 20,332 |
| Fayette County | 20,880 | 20,054 |
| Henry County | 20,145 | 19,773 |
| Jackson County | 19,848 | 19,472 |
| Poweshiek County | 18,914 | 18,533 |
| Cedar County | 18,499 | 18,454 |
| Jefferson County | 16,843 | 18,090 |
| Clayton County | 18,129 | 17,590 |
| Delaware County | 17,764 | 17,327 |
| Tama County | 17,767 | 17,319 |
| Dickinson County | 16,667 | 17,243 |
| Hardin County | 17,534 | 17,226 |
| Crawford County | 17,096 | 16,940 |
| Clay County | 16,667 | 16,333 |
| Iowa County | 16,355 | 16,311 |
| Floyd County | 16,303 | 15,873 |
| Madison County | 15,679 | 15,848 |
| Page County | 15,932 | 15,391 |
| Kossuth County | 15,543 | 15,114 |
| Hamilton County | 15,673 | 15,076 |
| Mills County | 15,059 | 14,972 |
| Butler County | 14,867 | 14,791 |
| Harrison County | 14,928 | 14,149 |
| O’Brien County | 14,398 | 14,020 |
| Allamakee County | 14,330 | 13,884 |
| Cass County | 13,956 | 13,157 |
| Wright County | 13,229 | 12,779 |
| Appanoose County | 12,887 | 12,462 |
| Union County | 12,534 | 12,420 |
| Grundy County | 12,453 | 12,313 |
| Chickasaw County | 12,439 | 12,023 |
| Shelby County | 12,167 | 11,800 |
| Lyon County | 11,581 | 11,754 |
| Cherokee County | 12,072 | 11,508 |
| Louisa County | 11,387 | 11,142 |
| Hancock County | 11,341 | 10,835 |
| Mitchell County | 10,776 | 10,763 |
| Winnebago County | 10,866 | 10,631 |
| Guthrie County | 10,954 | 10,625 |
| Montgomery County | 10,740 | 10,225 |
| Franklin County | 10,680 | 10,170 |
| Keokuk County | 10,511 | 10,119 |
| Sac County | 10,350 | 9,876 |
| Calhoun County | 9,670 | 9,846 |
| Emmet County | 10,302 | 9,658 |
| Humboldt County | 9,815 | 9,487 |
| Howard County | 9,566 | 9,332 |
| Clarke County | 9,286 | 9,309 |
| Palo Alto County | 9,421 | 9,047 |
| Greene County | 9,336 | 9,011 |
| Monona County | 9,243 | 8,898 |
| Davis County | 8,753 | 8,860 |
| Lucas County | 8,898 | 8,647 |
| Decatur County | 8,457 | 8,141 |
| Monroe County | 7,970 | 7,870 |
| Worth County | 7,598 | 7,572 |
| Van Buren County | 7,570 | 7,271 |
| Adair County | 7,682 | 7,092 |
| Ida County | 7,089 | 6,985 |
| Fremont County | 7,441 | 6,950 |
| Pocahontas County | 7,310 | 6,886 |
| Wayne County | 6,403 | 6,452 |
| Taylor County | 6,317 | 6,216 |
| Osceola County | 6,462 | 6,064 |
| Audubon County | 6,119 | 5,678 |
| Ringgold County | 5,131 | 5,068 |
| Adams County | 4,029 | 3,693 |
| Total Population of Iowa | 3,046,355 | 3,134,693 |
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