Ranking of Iowa Counties By Population in 2016
Updated on June 21, 2025.
Based on the US Census Vintage data estimates, in 2016, the Population for Iowa was 3.13M. Among all Iowa counties, Polk County had the highest population (474.59K), followed by Linn County (222.30K), and Scott County (172.36K).
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), 2016 Census.
See this for other years:
Ranking of Iowa Counties By Population in 2016
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| Rank | County | Population |
|---|---|---|
| 1 | Polk County | 474593 |
| 2 | Linn County | 222299 |
| 3 | Scott County | 172361 |
| 4 | Johnson County | 147167 |
| 5 | Black Hawk County | 133144 |
| 6 | Woodbury County | 102654 |
| 7 | Story County | 97012 |
| 8 | Dubuque County | 96819 |
| 9 | Pottawattamie County | 93649 |
| 10 | Dallas County | 84278 |
| 11 | Warren County | 49383 |
| 12 | Clinton County | 47285 |
| 13 | Cerro Gordo County | 43107 |
| 14 | Muscatine County | 42942 |
| 15 | Marshall County | 40122 |
| 16 | Des Moines County | 39719 |
| 17 | Webster County | 36813 |
| 18 | Jasper County | 36722 |
| 19 | Wapello County | 35270 |
| 20 | Sioux County | 34955 |
| 21 | Lee County | 34441 |
| 22 | Marion County | 33157 |
| 23 | Boone County | 26434 |
| 24 | Benton County | 25634 |
| 25 | Plymouth County | 25207 |
| 26 | Bremer County | 24796 |
| 27 | Mahaska County | 22325 |
| 28 | Washington County | 22147 |
| 29 | Buchanan County | 20999 |
| 30 | Winneshiek County | 20432 |
| 31 | Jones County | 20385 |
| 32 | Carroll County | 20362 |
| 33 | Buena Vista County | 20327 |
| 34 | Fayette County | 19858 |
| 35 | Henry County | 19842 |
| 36 | Jackson County | 19406 |
| 37 | Cedar County | 18351 |
| 38 | Poweshiek County | 18297 |
| 39 | Jefferson County | 18027 |
| 40 | Clayton County | 17657 |
| 41 | Delaware County | 17289 |
| 42 | Tama County | 17212 |
| 43 | Hardin County | 17193 |
| 44 | Dickinson County | 17135 |
| 45 | Crawford County | 17107 |
| 46 | Clay County | 16301 |
| 47 | Iowa County | 16202 |
| 48 | Floyd County | 15870 |
| 49 | Madison County | 15800 |
| 50 | Page County | 15343 |
| 51 | Kossuth County | 15104 |
| 52 | Hamilton County | 15090 |
| 53 | Mills County | 15041 |
| 54 | Butler County | 14694 |
| 55 | Harrison County | 14051 |
| 56 | O'Brien County | 13921 |
| 57 | Allamakee County | 13847 |
| 58 | Cass County | 13198 |
| 59 | Wright County | 12825 |
| 60 | Appanoose County | 12515 |
| 61 | Union County | 12366 |
| 62 | Grundy County | 12303 |
| 63 | Chickasaw County | 12098 |
| 64 | Lyon County | 11800 |
| 65 | Shelby County | 11662 |
| 66 | Cherokee County | 11386 |
| 67 | Louisa County | 11219 |
| 68 | Hancock County | 10887 |
| 69 | Guthrie County | 10661 |
| 70 | Mitchell County | 10650 |
| 71 | Winnebago County | 10599 |
| 72 | Franklin County | 10173 |
| 73 | Keokuk County | 10171 |
| 74 | Montgomery County | 10135 |
| 75 | Calhoun County | 9808 |
| 76 | Sac County | 9804 |
| 77 | Emmet County | 9588 |
| 78 | Humboldt County | 9530 |
| 79 | Clarke County | 9293 |
| 80 | Howard County | 9261 |
| 81 | Palo Alto County | 9032 |
| 82 | Greene County | 9011 |
| 83 | Davis County | 8893 |
| 84 | Monona County | 8779 |
| 85 | Lucas County | 8565 |
| 86 | Decatur County | 8061 |
| 87 | Monroe County | 7835 |
| 88 | Worth County | 7470 |
| 89 | Van Buren County | 7243 |
| 90 | Adair County | 7006 |
| 91 | Ida County | 6960 |
| 92 | Fremont County | 6945 |
| 93 | Pocahontas County | 6845 |
| 94 | Wayne County | 6438 |
| 95 | Taylor County | 6219 |
| 96 | Osceola County | 6089 |
| 97 | Audubon County | 5625 |
| 98 | Ringgold County | 4994 |
| 99 | Adams County | 3690 |
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