Ranking of Iowa Counties By Population in 2011
Updated on June 21, 2025.
Based on the US Census Vintage data estimates, in 2011, the Population for Iowa was 3.07M. Among all Iowa counties, Polk County had the highest population (438.78K), followed by Linn County (214.24K), and Scott County (166.69K).
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), 2011 Census.
See this for other years:
Ranking of Iowa Counties By Population in 2011
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| Rank | County | Population |
|---|---|---|
| 1 | Polk County | 438783 |
| 2 | Linn County | 214242 |
| 3 | Scott County | 166686 |
| 4 | Johnson County | 134125 |
| 5 | Black Hawk County | 131598 |
| 6 | Woodbury County | 102741 |
| 7 | Dubuque County | 94656 |
| 8 | Pottawattamie County | 93517 |
| 9 | Story County | 91164 |
| 10 | Dallas County | 69699 |
| 11 | Clinton County | 49105 |
| 12 | Warren County | 46654 |
| 13 | Cerro Gordo County | 43971 |
| 14 | Muscatine County | 42847 |
| 15 | Marshall County | 41013 |
| 16 | Des Moines County | 40074 |
| 17 | Webster County | 37754 |
| 18 | Jasper County | 36624 |
| 19 | Lee County | 35575 |
| 20 | Wapello County | 35484 |
| 21 | Sioux County | 34022 |
| 22 | Marion County | 33274 |
| 23 | Boone County | 26287 |
| 24 | Benton County | 26079 |
| 25 | Plymouth County | 24824 |
| 26 | Bremer County | 24383 |
| 27 | Mahaska County | 22506 |
| 28 | Washington County | 21825 |
| 29 | Winneshiek County | 21055 |
| 30 | Fayette County | 20975 |
| 31 | Buchanan County | 20911 |
| 32 | Carroll County | 20860 |
| 33 | Jones County | 20743 |
| 34 | Buena Vista County | 20310 |
| 35 | Henry County | 20252 |
| 36 | Jackson County | 19734 |
| 37 | Poweshiek County | 18900 |
| 38 | Cedar County | 18362 |
| 39 | Clayton County | 18019 |
| 40 | Delaware County | 17631 |
| 41 | Tama County | 17613 |
| 42 | Hardin County | 17376 |
| 43 | Crawford County | 17213 |
| 44 | Jefferson County | 17099 |
| 45 | Dickinson County | 16861 |
| 46 | Clay County | 16598 |
| 47 | Iowa County | 16324 |
| 48 | Floyd County | 16095 |
| 49 | Page County | 15900 |
| 50 | Madison County | 15738 |
| 51 | Hamilton County | 15468 |
| 52 | Kossuth County | 15396 |
| 53 | Mills County | 15031 |
| 54 | Butler County | 14966 |
| 55 | Harrison County | 14764 |
| 56 | Allamakee County | 14224 |
| 57 | O'Brien County | 14217 |
| 58 | Cass County | 13762 |
| 59 | Wright County | 13032 |
| 60 | Appanoose County | 12853 |
| 61 | Union County | 12555 |
| 62 | Grundy County | 12478 |
| 63 | Chickasaw County | 12407 |
| 64 | Cherokee County | 12027 |
| 65 | Shelby County | 11997 |
| 66 | Lyon County | 11694 |
| 67 | Louisa County | 11384 |
| 68 | Hancock County | 11296 |
| 69 | Guthrie County | 10864 |
| 70 | Mitchell County | 10709 |
| 71 | Winnebago County | 10699 |
| 72 | Franklin County | 10695 |
| 73 | Montgomery County | 10633 |
| 74 | Keokuk County | 10399 |
| 75 | Sac County | 10223 |
| 76 | Emmet County | 10092 |
| 77 | Calhoun County | 10064 |
| 78 | Humboldt County | 9782 |
| 79 | Howard County | 9548 |
| 80 | Palo Alto County | 9354 |
| 81 | Greene County | 9331 |
| 82 | Clarke County | 9318 |
| 83 | Monona County | 9238 |
| 84 | Lucas County | 8879 |
| 85 | Davis County | 8772 |
| 86 | Decatur County | 8250 |
| 87 | Monroe County | 8057 |
| 88 | Worth County | 7560 |
| 89 | Adair County | 7546 |
| 90 | Van Buren County | 7512 |
| 91 | Fremont County | 7371 |
| 92 | Pocahontas County | 7203 |
| 93 | Ida County | 7046 |
| 94 | Wayne County | 6337 |
| 95 | Osceola County | 6315 |
| 96 | Taylor County | 6301 |
| 97 | Audubon County | 6000 |
| 98 | Ringgold County | 5048 |
| 99 | Adams County | 3994 |
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