Ranking of Iowa Counties By Population with Irish Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 407.89K people in Iowa with Irish ancestry. Among all Iowa counties, Polk County had the highest population with Irish ancestry (62.93K), followed by Linn County (32.20K), and Scott County (27.23K).
The chart and table below shows the top 10 counties with high number of people with Irish 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 Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Polk County | 62928 |
| 2 | Linn County | 32202 |
| 3 | Scott County | 27230 |
| 4 | Dubuque County | 20964 |
| 5 | Johnson County | 20294 |
| 6 | Black Hawk County | 15735 |
| 7 | Dallas County | 12622 |
| 7 | Woodbury County | 12622 |
| 8 | Pottawattamie County | 12141 |
| 9 | Story County | 11309 |
| 10 | Clinton County | 7688 |
| 11 | Warren County | 6706 |
| 12 | Jasper County | 5173 |
| 13 | Lee County | 4839 |
| 14 | Cerro Gordo County | 4838 |
| 15 | Des Moines County | 4617 |
| 16 | Marion County | 4260 |
| 17 | Webster County | 4179 |
| 18 | Boone County | 4004 |
| 19 | Muscatine County | 3768 |
| 20 | Wapello County | 3740 |
| 21 | Jones County | 3491 |
| 22 | Benton County | 3456 |
| 23 | Jackson County | 3227 |
| 24 | Marshall County | 3223 |
| 25 | Buchanan County | 3070 |
| 26 | Washington County | 3037 |
| 27 | Bremer County | 3013 |
| 28 | Plymouth County | 2996 |
| 29 | Mahaska County | 2948 |
| 30 | Carroll County | 2941 |
| 31 | Poweshiek County | 2865 |
| 32 | Fayette County | 2844 |
| 33 | Delaware County | 2570 |
| 34 | Cedar County | 2478 |
| 35 | Madison County | 2462 |
| 36 | Henry County | 2407 |
| 37 | Iowa County | 2378 |
| 38 | Allamakee County | 2344 |
| 39 | Winneshiek County | 2203 |
| 40 | Page County | 2196 |
| 41 | Harrison County | 2152 |
| 42 | Clayton County | 2144 |
| 43 | Dickinson County | 1928 |
| 44 | Floyd County | 1878 |
| 45 | Sioux County | 1803 |
| 46 | Buena Vista County | 1786 |
| 47 | Tama County | 1775 |
| 48 | Clay County | 1749 |
| 49 | Cass County | 1746 |
| 50 | Palo Alto County | 1708 |
| 51 | Mills County | 1705 |
| 52 | Jefferson County | 1692 |
| 53 | Kossuth County | 1676 |
| 54 | Hardin County | 1616 |
| 55 | Chickasaw County | 1607 |
| 56 | Shelby County | 1594 |
| 57 | Hamilton County | 1589 |
| 58 | Monona County | 1540 |
| 59 | Butler County | 1430 |
| 60 | Keokuk County | 1400 |
| 61 | Union County | 1357 |
| 62 | Appanoose County | 1345 |
| 63 | Monroe County | 1328 |
| 64 | Guthrie County | 1256 |
| 65 | Lucas County | 1223 |
| 66 | Calhoun County | 1217 |
| 67 | Humboldt County | 1203 |
| 68 | Greene County | 1172 |
| 69 | Montgomery County | 1170 |
| 70 | Cherokee County | 1157 |
| 71 | Crawford County | 1104 |
| 72 | Pocahontas County | 1102 |
| 73 | Mitchell County | 1074 |
| 74 | Louisa County | 1066 |
| 75 | Grundy County | 1040 |
| 76 | Wright County | 1039 |
| 77 | Adair County | 1009 |
| 78 | Clarke County | 982 |
| 79 | Howard County | 895 |
| 80 | Sac County | 875 |
| 81 | Emmet County | 872 |
| 82 | Decatur County | 858 |
| 83 | Lyon County | 848 |
| 84 | Davis County | 839 |
| 85 | Hancock County | 828 |
| 86 | O'Brien County | 821 |
| 87 | Fremont County | 819 |
| 88 | Franklin County | 814 |
| 89 | Van Buren County | 798 |
| 90 | Wayne County | 773 |
| 91 | Worth County | 681 |
| 92 | Ida County | 624 |
| 93 | Ringgold County | 615 |
| 94 | Osceola County | 613 |
| 95 | Adams County | 566 |
| 96 | Winnebago County | 525 |
| 97 | Taylor County | 496 |
| 98 | Audubon County | 363 |
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