Ranking of Iowa Counties By Population in 2023
Updated on June 21, 2025.
Based on the US Census Vintage data estimates, in 2023, the Population for Iowa was 3.22M. Among all Iowa counties, Polk County had the highest population (507.49K), followed by Linn County (229.40K), and Scott County (174.59K).
The chart below shows the top 10 counties, and the table below shows the ranking of all Iowa counties.
You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.
Related Topics: Iowa Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage), 2023 Census.
See this for other years:
Ranking of Iowa Counties By Population in 2023
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| Rank | County | Population |
|---|---|---|
| 1 | Polk County | 507487 |
| 2 | Linn County | 229402 |
| 3 | Scott County | 174589 |
| 4 | Johnson County | 158202 |
| 5 | Black Hawk County | 131179 |
| 6 | Dallas County | 111593 |
| 7 | Woodbury County | 106544 |
| 8 | Story County | 101501 |
| 9 | Dubuque County | 98988 |
| 10 | Pottawattamie County | 93353 |
| 11 | Warren County | 55298 |
| 12 | Clinton County | 46134 |
| 13 | Cerro Gordo County | 42470 |
| 14 | Muscatine County | 42316 |
| 15 | Marshall County | 40230 |
| 16 | Des Moines County | 38360 |
| 17 | Jasper County | 37991 |
| 18 | Webster County | 36653 |
| 19 | Sioux County | 36399 |
| 20 | Wapello County | 35417 |
| 21 | Marion County | 33718 |
| 22 | Lee County | 32509 |
| 23 | Boone County | 26567 |
| 24 | Benton County | 25769 |
| 25 | Plymouth County | 25765 |
| 26 | Bremer County | 25304 |
| 27 | Washington County | 22554 |
| 28 | Mahaska County | 21967 |
| 29 | Jones County | 20917 |
| 30 | Buchanan County | 20725 |
| 31 | Buena Vista County | 20698 |
| 32 | Carroll County | 20512 |
| 33 | Winneshiek County | 19728 |
| 34 | Henry County | 19573 |
| 35 | Jackson County | 19353 |
| 36 | Fayette County | 19239 |
| 37 | Poweshiek County | 18497 |
| 38 | Cedar County | 18269 |
| 39 | Dickinson County | 18087 |
| 40 | Delaware County | 17583 |
| 41 | Madison County | 16999 |
| 42 | Clayton County | 16985 |
| 43 | Tama County | 16787 |
| 44 | Clay County | 16530 |
| 45 | Hardin County | 16523 |
| 46 | Iowa County | 16386 |
| 47 | Crawford County | 16138 |
| 48 | Jefferson County | 15626 |
| 49 | Floyd County | 15266 |
| 50 | Page County | 15012 |
| 51 | Hamilton County | 14848 |
| 52 | Mills County | 14642 |
| 53 | Harrison County | 14638 |
| 54 | Kossuth County | 14410 |
| 55 | Butler County | 14225 |
| 56 | Allamakee County | 14168 |
| 57 | O'Brien County | 14067 |
| 58 | Cass County | 13131 |
| 59 | Wright County | 12744 |
| 60 | Grundy County | 12412 |
| 61 | Lyon County | 12288 |
| 62 | Appanoose County | 12129 |
| 63 | Union County | 11913 |
| 64 | Shelby County | 11823 |
| 65 | Chickasaw County | 11694 |
| 66 | Cherokee County | 11652 |
| 67 | Guthrie County | 10763 |
| 68 | Hancock County | 10631 |
| 69 | Winnebago County | 10563 |
| 70 | Mitchell County | 10544 |
| 71 | Louisa County | 10540 |
| 72 | Montgomery County | 10148 |
| 73 | Keokuk County | 9947 |
| 74 | Franklin County | 9895 |
| 75 | Calhoun County | 9790 |
| 76 | Sac County | 9663 |
| 77 | Clarke County | 9631 |
| 78 | Humboldt County | 9564 |
| 79 | Howard County | 9357 |
| 80 | Emmet County | 9277 |
| 81 | Davis County | 9165 |
| 82 | Palo Alto County | 8807 |
| 83 | Lucas County | 8775 |
| 84 | Greene County | 8597 |
| 85 | Monona County | 8503 |
| 86 | Decatur County | 7781 |
| 87 | Monroe County | 7486 |
| 88 | Adair County | 7399 |
| 89 | Worth County | 7322 |
| 90 | Van Buren County | 7266 |
| 91 | Pocahontas County | 7024 |
| 92 | Ida County | 6835 |
| 93 | Wayne County | 6542 |
| 94 | Fremont County | 6458 |
| 95 | Osceola County | 6016 |
| 96 | Taylor County | 5917 |
| 97 | Audubon County | 5533 |
| 98 | Ringgold County | 4646 |
| 99 | Adams County | 3553 |
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