Ranking of Iowa Counties By Population with American Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 140.16K people in Iowa with American ancestry. Among all Iowa counties, Polk County had the highest population with American ancestry (18.39K), followed by Linn County (8.75K), and Scott County (6.89K).
The chart and table below shows the top 10 counties with high number of people with American 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 American Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Polk County | 18391 |
| 2 | Linn County | 8754 |
| 3 | Scott County | 6886 |
| 4 | Black Hawk County | 6030 |
| 5 | Johnson County | 5554 |
| 6 | Pottawattamie County | 4942 |
| 7 | Dubuque County | 4600 |
| 8 | Woodbury County | 4503 |
| 9 | Dallas County | 3833 |
| 10 | Story County | 2553 |
| 11 | Warren County | 2511 |
| 12 | Wapello County | 2416 |
| 13 | Des Moines County | 2339 |
| 14 | Jasper County | 2320 |
| 15 | Clinton County | 2101 |
| 16 | Marion County | 1887 |
| 17 | Lee County | 1796 |
| 18 | Muscatine County | 1722 |
| 19 | Benton County | 1687 |
| 20 | Marshall County | 1615 |
| 21 | Webster County | 1547 |
| 22 | Mahaska County | 1526 |
| 23 | Washington County | 1440 |
| 24 | Cerro Gordo County | 1414 |
| 25 | Fayette County | 1326 |
| 26 | Buchanan County | 1215 |
| 27 | Sioux County | 1209 |
| 28 | Henry County | 1172 |
| 29 | Jefferson County | 1130 |
| 30 | Carroll County | 1101 |
| 31 | Bremer County | 1088 |
| 32 | Boone County | 1013 |
| 33 | Plymouth County | 1001 |
| 34 | Jackson County | 986 |
| 35 | Clayton County | 965 |
| 36 | Delaware County | 955 |
| 37 | Poweshiek County | 947 |
| 38 | Cedar County | 943 |
| 39 | Clay County | 941 |
| 40 | Allamakee County | 891 |
| 41 | Iowa County | 866 |
| 42 | Jones County | 864 |
| 43 | Davis County | 843 |
| 43 | Mitchell County | 843 |
| 44 | Madison County | 837 |
| 44 | Union County | 837 |
| 45 | Appanoose County | 829 |
| 46 | Harrison County | 766 |
| 47 | Winneshiek County | 760 |
| 48 | Keokuk County | 698 |
| 49 | Lucas County | 682 |
| 50 | Wayne County | 664 |
| 51 | Crawford County | 662 |
| 52 | Cass County | 661 |
| 53 | Grundy County | 650 |
| 54 | Page County | 649 |
| 55 | Butler County | 639 |
| 56 | Mills County | 635 |
| 57 | Dickinson County | 616 |
| 57 | Hardin County | 616 |
| 58 | Calhoun County | 570 |
| 59 | Tama County | 561 |
| 60 | Kossuth County | 533 |
| 61 | Louisa County | 527 |
| 62 | O'Brien County | 526 |
| 63 | Lyon County | 517 |
| 64 | Winnebago County | 510 |
| 65 | Decatur County | 491 |
| 65 | Wright County | 491 |
| 66 | Guthrie County | 490 |
| 67 | Floyd County | 489 |
| 67 | Hamilton County | 489 |
| 68 | Shelby County | 477 |
| 69 | Sac County | 473 |
| 70 | Montgomery County | 464 |
| 71 | Cherokee County | 461 |
| 72 | Van Buren County | 456 |
| 73 | Taylor County | 446 |
| 74 | Fremont County | 442 |
| 74 | Palo Alto County | 442 |
| 75 | Monona County | 424 |
| 76 | Hancock County | 414 |
| 77 | Greene County | 411 |
| 78 | Chickasaw County | 410 |
| 79 | Ida County | 405 |
| 80 | Buena Vista County | 403 |
| 81 | Monroe County | 393 |
| 82 | Ringgold County | 383 |
| 83 | Adair County | 355 |
| 84 | Clarke County | 349 |
| 85 | Franklin County | 338 |
| 86 | Humboldt County | 316 |
| 87 | Osceola County | 306 |
| 88 | Howard County | 300 |
| 89 | Emmet County | 280 |
| 90 | Pocahontas County | 269 |
| 91 | Audubon County | 268 |
| 92 | Adams County | 253 |
| 93 | Worth County | 161 |
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