Ranking of Iowa Counties By Total Population from Census 2020
Updated on February 7, 2023.
According to the data from the US 2020 Census, the most populated Iowa county as at April 2020 was Polk County (492.40K), followed by Linn County (230.30K), and Scott County (174.67K).
The chart below shows the top 10 most populated counties, and the table below shows the ranking of all the counties in the state of Iowa.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: Iowa Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Iowa Counties By Total Population from Census 2020
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| Rank | County | Population |
|---|---|---|
| 1 | Polk County | 492401 |
| 2 | Linn County | 230299 |
| 3 | Scott County | 174669 |
| 4 | Johnson County | 152854 |
| 5 | Black Hawk County | 131144 |
| 6 | Woodbury County | 105941 |
| 7 | Dallas County | 99678 |
| 8 | Dubuque County | 99266 |
| 9 | Story County | 98537 |
| 10 | Pottawattamie County | 93667 |
| 11 | Warren County | 52403 |
| 12 | Clinton County | 46460 |
| 13 | Muscatine County | 43235 |
| 14 | Cerro Gordo County | 43127 |
| 15 | Marshall County | 40105 |
| 16 | Des Moines County | 38910 |
| 17 | Jasper County | 37813 |
| 18 | Webster County | 36999 |
| 19 | Sioux County | 35872 |
| 20 | Wapello County | 35437 |
| 21 | Lee County | 33555 |
| 22 | Marion County | 33414 |
| 23 | Boone County | 26715 |
| 24 | Plymouth County | 25698 |
| 25 | Benton County | 25575 |
| 26 | Bremer County | 24988 |
| 27 | Washington County | 22565 |
| 28 | Mahaska County | 22190 |
| 29 | Buena Vista County | 20823 |
| 30 | Carroll County | 20760 |
| 31 | Jones County | 20646 |
| 32 | Buchanan County | 20565 |
| 33 | Henry County | 20482 |
| 34 | Winneshiek County | 20070 |
| 35 | Fayette County | 19509 |
| 36 | Jackson County | 19485 |
| 37 | Poweshiek County | 18662 |
| 38 | Cedar County | 18505 |
| 39 | Dickinson County | 17703 |
| 40 | Delaware County | 17488 |
| 41 | Tama County | 17135 |
| 42 | Clayton County | 17043 |
| 43 | Hardin County | 16878 |
| 44 | Iowa County | 16662 |
| 45 | Madison County | 16548 |
| 46 | Crawford County | 16525 |
| 47 | Clay County | 16384 |
| 48 | Jefferson County | 15663 |
| 49 | Floyd County | 15627 |
| 50 | Page County | 15211 |
| 51 | Hamilton County | 15039 |
| 52 | Kossuth County | 14828 |
| 53 | Harrison County | 14582 |
| 54 | Mills County | 14484 |
| 55 | Butler County | 14334 |
| 56 | O'Brien County | 14182 |
| 57 | Allamakee County | 14061 |
| 58 | Cass County | 13127 |
| 59 | Wright County | 12943 |
| 60 | Grundy County | 12329 |
| 61 | Appanoose County | 12317 |
| 62 | Union County | 12138 |
| 63 | Chickasaw County | 12012 |
| 64 | Lyon County | 11934 |
| 65 | Shelby County | 11746 |
| 66 | Cherokee County | 11658 |
| 67 | Louisa County | 10837 |
| 68 | Hancock County | 10795 |
| 69 | Winnebago County | 10679 |
| 70 | Guthrie County | 10623 |
| 71 | Mitchell County | 10565 |
| 72 | Montgomery County | 10330 |
| 73 | Keokuk County | 10033 |
| 74 | Franklin County | 10019 |
| 75 | Calhoun County | 9927 |
| 76 | Sac County | 9814 |
| 77 | Clarke County | 9748 |
| 78 | Humboldt County | 9597 |
| 79 | Howard County | 9469 |
| 80 | Emmet County | 9388 |
| 81 | Davis County | 9110 |
| 82 | Palo Alto County | 8996 |
| 83 | Greene County | 8771 |
| 84 | Monona County | 8751 |
| 85 | Lucas County | 8634 |
| 86 | Decatur County | 7645 |
| 87 | Monroe County | 7577 |
| 88 | Adair County | 7496 |
| 89 | Worth County | 7443 |
| 90 | Van Buren County | 7203 |
| 91 | Pocahontas County | 7078 |
| 92 | Ida County | 7005 |
| 93 | Fremont County | 6605 |
| 94 | Wayne County | 6497 |
| 95 | Osceola County | 6192 |
| 96 | Taylor County | 5896 |
| 97 | Audubon County | 5674 |
| 98 | Ringgold County | 4663 |
| 99 | Adams County | 3704 |