Ranking of Iowa Counties By Percentage of 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 (12.83% of Iowa population). Among all Iowa counties, Dubuque County had the highest percentage of its population with Irish ancestry (21.24%), followed by Palo Alto County (18.99%), and Monona County (17.64%).
The chart and table below shows the top 10 counties with high percentage of its population having 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 Percentage of Population with Irish Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | Dubuque County | 21.24 |
| 2 | Palo Alto County | 18.99 |
| 3 | Monona County | 17.64 |
| 4 | Monroe County | 17.50 |
| 5 | Jones County | 16.88 |
| 6 | Allamakee County | 16.66 |
| 7 | Jackson County | 16.55 |
| 8 | Clinton County | 16.50 |
| 9 | Scott County | 15.63 |
| 10 | Pocahontas County | 15.54 |
| 11 | Poweshiek County | 15.38 |
| 12 | Adams County | 15.31 |
| 13 | Madison County | 15.00 |
| 14 | Boone County | 14.98 |
| 15 | Buchanan County | 14.90 |
| 16 | Harrison County | 14.75 |
| 17 | Delaware County | 14.68 |
| 18 | Fayette County | 14.52 |
| 19 | Page County | 14.40 |
| 20 | Lee County | 14.35 |
| 21 | Iowa County | 14.33 |
| 22 | Carroll County | 14.17 |
| 23 | Lucas County | 14.14 |
| 24 | Linn County | 14.09 |
| 25 | Keokuk County | 13.93 |
| 26 | Jasper County | 13.73 |
| 27 | Shelby County | 13.57 |
| 28 | Adair County | 13.56 |
| 29 | Washington County | 13.48 |
| 30 | Benton County | 13.47 |
| 31 | Cedar County | 13.40 |
| 32 | Chickasaw County | 13.37 |
| 32 | Johnson County | 13.37 |
| 33 | Mahaska County | 13.32 |
| 34 | Cass County | 13.27 |
| 34 | Greene County | 13.27 |
| 35 | Dallas County | 13.07 |
| 36 | Pottawattamie County | 12.98 |
| 36 | Ringgold County | 12.98 |
| 37 | Warren County | 12.93 |
| 38 | Polk County | 12.87 |
| 39 | Marion County | 12.76 |
| 40 | Humboldt County | 12.50 |
| 41 | Clayton County | 12.49 |
| 42 | Calhoun County | 12.22 |
| 42 | Fremont County | 12.22 |
| 43 | Bremer County | 12.12 |
| 44 | Woodbury County | 12.01 |
| 45 | Black Hawk County | 11.98 |
| 45 | Floyd County | 11.98 |
| 46 | Wayne County | 11.89 |
| 47 | Guthrie County | 11.85 |
| 48 | Des Moines County | 11.82 |
| 49 | Henry County | 11.75 |
| 50 | Plymouth County | 11.73 |
| 51 | Mills County | 11.63 |
| 52 | Story County | 11.53 |
| 53 | Montgomery County | 11.33 |
| 54 | Kossuth County | 11.31 |
| 55 | Webster County | 11.26 |
| 56 | Cerro Gordo County | 11.20 |
| 57 | Union County | 11.13 |
| 58 | Decatur County | 11.12 |
| 59 | Van Buren County | 11.09 |
| 60 | Dickinson County | 11.00 |
| 61 | Winneshiek County | 10.96 |
| 62 | Appanoose County | 10.93 |
| 63 | Jefferson County | 10.68 |
| 64 | Clay County | 10.66 |
| 65 | Wapello County | 10.58 |
| 66 | Hamilton County | 10.54 |
| 67 | Tama County | 10.39 |
| 68 | Mitchell County | 10.20 |
| 69 | Clarke County | 10.09 |
| 70 | Cherokee County | 9.97 |
| 71 | Osceola County | 9.94 |
| 72 | Butler County | 9.92 |
| 73 | Louisa County | 9.79 |
| 74 | Hardin County | 9.51 |
| 75 | Howard County | 9.47 |
| 76 | Davis County | 9.25 |
| 77 | Emmet County | 9.24 |
| 78 | Worth County | 9.14 |
| 79 | Ida County | 8.94 |
| 80 | Sac County | 8.90 |
| 81 | Muscatine County | 8.73 |
| 82 | Buena Vista County | 8.62 |
| 83 | Grundy County | 8.43 |
| 84 | Taylor County | 8.36 |
| 85 | Franklin County | 8.10 |
| 86 | Marshall County | 8.03 |
| 87 | Wright County | 8.01 |
| 88 | Hancock County | 7.64 |
| 89 | Lyon County | 7.09 |
| 90 | Crawford County | 6.67 |
| 91 | Audubon County | 6.42 |
| 92 | O'Brien County | 5.81 |
| 93 | Sioux County | 5.06 |
| 94 | Winnebago County | 4.89 |
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