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The most populated counties in Iowa are Polk County with 493,378, Linn County at 229,308, Scott County with 174,315, Johnson County at 153,360, and Black Hawk County with 131,041. You can get the most current Census population data for all 99 Iowa counties, sorted from the most populous counties in Iowa to the least, according to the 2022 American Community Survey.
Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest Iowa counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!
| Rank | County | Population |
|---|---|---|
| 1 | Polk County | 493,378 |
| 2 | Linn County | 229,308 |
| 3 | Scott County | 174,315 |
| 4 | Johnson County | 153,360 |
| 5 | Black Hawk County | 131,041 |
| 6 | Woodbury County | 105,526 |
| 7 | Dallas County | 100,367 |
| 8 | Dubuque County | 98,812 |
| 9 | Story County | 98,573 |
| 10 | Pottawattamie County | 93,543 |
| 11 | Warren County | 52,709 |
| 12 | Clinton County | 46,488 |
| 13 | Cerro Gordo County | 42,979 |
| 14 | Muscatine County | 42,968 |
| 15 | Marshall County | 40,049 |
| 16 | Des Moines County | 38,824 |
| 17 | Jasper County | 37,808 |
| 18 | Webster County | 36,986 |
| 19 | Sioux County | 35,815 |
| 20 | Wapello County | 35,292 |
| 21 | Marion County | 33,487 |
| 22 | Lee County | 33,442 |
| 23 | Boone County | 26,700 |
| 24 | Benton County | 25,652 |
| 25 | Plymouth County | 25,621 |
| 26 | Bremer County | 25,012 |
| 27 | Washington County | 22,534 |
| 28 | Mahaska County | 22,059 |
| 29 | Jones County | 20,733 |
| 30 | Carroll County | 20,728 |
| 31 | Buena Vista County | 20,687 |
| 32 | Buchanan County | 20,631 |
| 33 | Henry County | 20,436 |
| 34 | Winneshiek County | 20,050 |
| 35 | Fayette County | 19,519 |
| 36 | Jackson County | 19,470 |
| 37 | Poweshiek County | 18,608 |
| 38 | Cedar County | 18,479 |
| 39 | Dickinson County | 17,692 |
| 40 | Delaware County | 17,523 |
| 41 | Clayton County | 17,123 |
| 42 | Tama County | 17,017 |
| 43 | Hardin County | 16,861 |
| 44 | Madison County | 16,609 |
| 45 | Iowa County | 16,575 |
| 46 | Crawford County | 16,450 |
| 47 | Clay County | 16,423 |
| 48 | Jefferson County | 15,785 |
| 49 | Floyd County | 15,601 |
| 50 | Page County | 15,225 |
| 51 | Hamilton County | 14,979 |
| 52 | Kossuth County | 14,718 |
| 53 | Harrison County | 14,623 |
| 54 | Mills County | 14,605 |
| 55 | Butler County | 14,376 |
| 56 | O'Brien County | 14,138 |
| 57 | Allamakee County | 14,046 |
| 58 | Cass County | 13,116 |
| 59 | Wright County | 12,897 |
| 60 | Grundy County | 12,351 |
| 61 | Appanoose County | 12,279 |
| 62 | Union County | 12,107 |
| 63 | Lyon County | 12,023 |
| 64 | Chickasaw County | 11,957 |
| 65 | Shelby County | 11,737 |
| 66 | Cherokee County | 11,601 |
| 67 | Louisa County | 10,823 |
| 68 | Hancock County | 10,790 |
| 69 | Winnebago County | 10,704 |
| 70 | Guthrie County | 10,619 |
| 71 | Mitchell County | 10,537 |
| 72 | Montgomery County | 10,285 |
| 73 | Keokuk County | 10,026 |
| 74 | Franklin County | 10,015 |
| 75 | Calhoun County | 9,893 |
| 76 | Sac County | 9,778 |
| 77 | Clarke County | 9,737 |
| 78 | Humboldt County | 9,606 |
| 79 | Howard County | 9,479 |
| 80 | Emmet County | 9,349 |
| 81 | Davis County | 9,093 |
| 82 | Palo Alto County | 8,938 |
| 83 | Greene County | 8,801 |
| 84 | Monona County | 8,671 |
| 85 | Lucas County | 8,666 |
| 86 | Decatur County | 7,684 |
| 87 | Monroe County | 7,574 |
| 88 | Adair County | 7,479 |
| 89 | Worth County | 7,417 |
| 90 | Van Buren County | 7,207 |
| 91 | Pocahontas County | 7,061 |
| 92 | Ida County | 6,969 |
| 93 | Fremont County | 6,639 |
| 94 | Wayne County | 6,484 |
| 95 | Osceola County | 6,149 |
| 96 | Taylor County | 5,916 |
| 97 | Audubon County | 5,651 |
| 98 | Ringgold County | 4,690 |
| 99 | Adams County | 3,680 |
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United States Census Bureau. B01001 SEX BY AGE, 2022 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 7 December 2023. http://www.census.gov/. |
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