Ranking of Iowa Counties By Population with Unclassified Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 796.79K people in Iowa with Unclassified ancestry. Among all Iowa counties, Polk County had the highest population with Unclassified ancestry (112.79K), followed by Linn County (60.54K), and Scott County (42.24K).
The chart and table below shows the top 10 counties with high number of people with Unclassified ancestry.
You can see similar information for other states and for other ancestry groups in Iowa.
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Related Topics: Iowa ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of Iowa Counties By Population with Unclassified Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Polk County | 112787 |
| 2 | Linn County | 60543 |
| 3 | Scott County | 42243 |
| 4 | Black Hawk County | 36493 |
| 5 | Johnson County | 30681 |
| 6 | Story County | 23755 |
| 7 | Dallas County | 23109 |
| 8 | Pottawattamie County | 21621 |
| 9 | Woodbury County | 21155 |
| 10 | Dubuque County | 20333 |
| 11 | Muscatine County | 15447 |
| 12 | Warren County | 13871 |
| 13 | Clinton County | 13579 |
| 14 | Webster County | 12745 |
| 15 | Des Moines County | 12092 |
| 16 | Cerro Gordo County | 11152 |
| 17 | Lee County | 10583 |
| 18 | Wapello County | 10436 |
| 19 | Marshall County | 10230 |
| 20 | Jasper County | 9654 |
| 21 | Marion County | 8436 |
| 22 | Benton County | 7631 |
| 23 | Boone County | 7106 |
| 24 | Washington County | 6739 |
| 25 | Buchanan County | 5877 |
| 26 | Plymouth County | 5856 |
| 27 | Henry County | 5813 |
| 28 | Bremer County | 5659 |
| 29 | Sioux County | 5585 |
| 30 | Mahaska County | 5569 |
| 31 | Madison County | 5282 |
| 32 | Poweshiek County | 5199 |
| 33 | Jackson County | 5029 |
| 34 | Jones County | 4980 |
| 35 | Hardin County | 4907 |
| 36 | Cedar County | 4879 |
| 37 | Appanoose County | 4696 |
| 38 | Carroll County | 4659 |
| 39 | Jefferson County | 4498 |
| 40 | Fayette County | 4463 |
| 41 | Delaware County | 4454 |
| 42 | Clayton County | 4389 |
| 43 | Tama County | 4351 |
| 44 | Page County | 4296 |
| 45 | Louisa County | 4223 |
| 46 | Iowa County | 4146 |
| 47 | Buena Vista County | 4144 |
| 48 | Dickinson County | 4030 |
| 49 | Mills County | 3944 |
| 50 | Hamilton County | 3927 |
| 51 | Clay County | 3919 |
| 52 | Floyd County | 3898 |
| 53 | Cass County | 3869 |
| 54 | Union County | 3823 |
| 55 | O'Brien County | 3694 |
| 56 | Harrison County | 3495 |
| 57 | Cherokee County | 3471 |
| 58 | Winneshiek County | 3435 |
| 59 | Kossuth County | 3361 |
| 60 | Butler County | 3274 |
| 61 | Greene County | 3240 |
| 62 | Grundy County | 3209 |
| 63 | Montgomery County | 3136 |
| 64 | Crawford County | 3118 |
| 65 | Shelby County | 3094 |
| 66 | Guthrie County | 3077 |
| 67 | Hancock County | 3019 |
| 68 | Emmet County | 2996 |
| 69 | Keokuk County | 2938 |
| 70 | Humboldt County | 2911 |
| 71 | Chickasaw County | 2845 |
| 72 | Davis County | 2802 |
| 73 | Clarke County | 2775 |
| 74 | Calhoun County | 2764 |
| 75 | Allamakee County | 2729 |
| 76 | Van Buren County | 2699 |
| 77 | Wright County | 2687 |
| 78 | Mitchell County | 2532 |
| 79 | Sac County | 2503 |
| 80 | Decatur County | 2478 |
| 81 | Howard County | 2355 |
| 82 | Lucas County | 2340 |
| 83 | Lyon County | 2312 |
| 84 | Monroe County | 2261 |
| 85 | Winnebago County | 2244 |
| 86 | Franklin County | 2181 |
| 87 | Wayne County | 2129 |
| 88 | Pocahontas County | 1980 |
| 89 | Adair County | 1906 |
| 90 | Monona County | 1905 |
| 91 | Worth County | 1869 |
| 92 | Palo Alto County | 1861 |
| 93 | Taylor County | 1741 |
| 94 | Fremont County | 1724 |
| 95 | Audubon County | 1636 |
| 96 | Ringgold County | 1628 |
| 97 | Ida County | 1505 |
| 98 | Osceola County | 1205 |
| 99 | Adams County | 941 |
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