Ranking of Iowa Counties By Population with Scotch Irish Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 21.93K people in Iowa with Scotch Irish ancestry. Among all Iowa counties, Polk County had the highest population with Scotch Irish ancestry (4.07K), followed by Linn County (1.73K), and Johnson County (1.18K).
The chart and table below shows the top 10 counties with high number of people with Scotch 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 Scotch Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Polk County | 4070 |
| 2 | Linn County | 1732 |
| 3 | Johnson County | 1182 |
| 4 | Scott County | 1099 |
| 5 | Black Hawk County | 1059 |
| 6 | Story County | 658 |
| 7 | Woodbury County | 646 |
| 8 | Pottawattamie County | 532 |
| 9 | Warren County | 528 |
| 10 | Dallas County | 509 |
| 11 | Boone County | 422 |
| 12 | Des Moines County | 382 |
| 13 | Wapello County | 309 |
| 14 | Dubuque County | 258 |
| 15 | Cerro Gordo County | 256 |
| 16 | Washington County | 254 |
| 17 | Marshall County | 247 |
| 18 | Clinton County | 230 |
| 19 | Mills County | 219 |
| 20 | Sioux County | 207 |
| 21 | Bremer County | 201 |
| 22 | Henry County | 198 |
| 22 | Muscatine County | 198 |
| 23 | Jasper County | 195 |
| 24 | Lee County | 184 |
| 25 | Appanoose County | 178 |
| 25 | Dickinson County | 178 |
| 25 | Union County | 178 |
| 26 | Webster County | 175 |
| 27 | Benton County | 174 |
| 28 | Iowa County | 161 |
| 29 | Plymouth County | 158 |
| 30 | Mahaska County | 155 |
| 31 | Poweshiek County | 146 |
| 32 | Marion County | 142 |
| 33 | Butler County | 141 |
| 33 | Harrison County | 141 |
| 34 | Van Buren County | 137 |
| 35 | Buchanan County | 132 |
| 36 | Montgomery County | 130 |
| 36 | Winneshiek County | 130 |
| 37 | Clay County | 125 |
| 38 | Keokuk County | 124 |
| 39 | Fayette County | 114 |
| 40 | Madison County | 112 |
| 41 | Hamilton County | 110 |
| 42 | Tama County | 109 |
| 43 | Ringgold County | 104 |
| 44 | Decatur County | 103 |
| 45 | Cass County | 99 |
| 45 | Hancock County | 99 |
| 46 | Lucas County | 94 |
| 47 | Chickasaw County | 93 |
| 48 | Franklin County | 90 |
| 48 | Greene County | 90 |
| 49 | Clayton County | 89 |
| 49 | Floyd County | 89 |
| 50 | Guthrie County | 88 |
| 51 | Grundy County | 87 |
| 52 | Wayne County | 85 |
| 52 | Wright County | 85 |
| 53 | Page County | 81 |
| 54 | Mitchell County | 77 |
| 55 | Jones County | 75 |
| 56 | Howard County | 71 |
| 57 | Clarke County | 69 |
| 57 | Sac County | 69 |
| 58 | Davis County | 68 |
| 58 | Monroe County | 68 |
| 59 | Hardin County | 67 |
| 60 | Palo Alto County | 65 |
| 61 | Calhoun County | 64 |
| 62 | Louisa County | 62 |
| 63 | Jackson County | 59 |
| 64 | Cedar County | 58 |
| 65 | Jefferson County | 55 |
| 66 | Allamakee County | 54 |
| 67 | Kossuth County | 51 |
| 68 | Adair County | 50 |
| 68 | Fremont County | 50 |
| 69 | Pocahontas County | 48 |
| 70 | Audubon County | 46 |
| 70 | Buena Vista County | 46 |
| 71 | Shelby County | 40 |
| 72 | Taylor County | 38 |
| 73 | Emmet County | 36 |
| 74 | Worth County | 31 |
| 75 | Winnebago County | 29 |
| 76 | Carroll County | 25 |
| 77 | Osceola County | 23 |
| 78 | Ida County | 22 |
| 78 | Monona County | 22 |
| 79 | Adams County | 21 |
| 80 | Crawford County | 16 |
| 81 | Humboldt County | 15 |
| 82 | Delaware County | 14 |
| 83 | Cherokee County | 11 |
| 84 | O'Brien County | 7 |
| 85 | Lyon County | 6 |
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