Ranking of Iowa Counties By White Alone Population Aged 25 years and above with an Educational attainment of High School Graduate or Equivalent in 2021 (ACS-5Yrs)
Updated on September 5, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the Iowa White Alone population (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 598,706. Among all Iowa counties, Polk County had the highest White Alone population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (69,202), followed by Linn County (35,954), and Scott County (28,648).
The chart below shows the top 10 Iowa counties, and the table below shows the ranking of all Iowa counties.
You can see similar information for other educational attainments, and for other races and ethnicities.
You can also see similar information for other states and for the United States.
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Related Topics: Iowa ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Iowa Counties By White Alone Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Polk County | 69202 |
| 2 | Linn County | 35954 |
| 3 | Scott County | 28648 |
| 4 | Black Hawk County | 21577 |
| 5 | Dubuque County | 20581 |
| 6 | Pottawattamie County | 19421 |
| 7 | Woodbury County | 18341 |
| 8 | Clinton County | 11718 |
| 9 | Johnson County | 11175 |
| 10 | Dallas County | 10805 |
| 11 | Cerro Gordo County | 9985 |
| 12 | Jasper County | 9982 |
| 13 | Warren County | 9738 |
| 14 | Muscatine County | 8599 |
| 15 | Lee County | 8404 |
| 16 | Marshall County | 8234 |
| 17 | Wapello County | 8209 |
| 18 | Des Moines County | 8197 |
| 19 | Webster County | 8057 |
| 20 | Story County | 7946 |
| 21 | Marion County | 7152 |
| 22 | Benton County | 6412 |
| 23 | Boone County | 5904 |
| 24 | Plymouth County | 5822 |
| 25 | Sioux County | 5723 |
| 26 | Jackson County | 5636 |
| 27 | Mahaska County | 5529 |
| 28 | Fayette County | 5522 |
| 29 | Washington County | 5414 |
| 30 | Jones County | 5398 |
| 31 | Clayton County | 5236 |
| 32 | Delaware County | 5089 |
| 33 | Cedar County | 4990 |
| 34 | Bremer County | 4880 |
| 35 | Carroll County | 4710 |
| 36 | Buchanan County | 4673 |
| 36 | Henry County | 4673 |
| 37 | Poweshiek County | 4590 |
| 38 | Winneshiek County | 4385 |
| 39 | Tama County | 4236 |
| 40 | Hardin County | 4205 |
| 41 | Page County | 4175 |
| 42 | Iowa County | 4153 |
| 43 | Harrison County | 3904 |
| 44 | Floyd County | 3898 |
| 45 | Allamakee County | 3821 |
| 46 | Madison County | 3677 |
| 47 | Butler County | 3675 |
| 48 | Clay County | 3672 |
| 49 | Chickasaw County | 3638 |
| 50 | Kossuth County | 3565 |
| 51 | O'Brien County | 3435 |
| 52 | Dickinson County | 3409 |
| 53 | Hamilton County | 3312 |
| 54 | Crawford County | 3303 |
| 55 | Cherokee County | 3249 |
| 56 | Wright County | 3195 |
| 57 | Buena Vista County | 3163 |
| 58 | Cass County | 3127 |
| 59 | Mills County | 3107 |
| 60 | Appanoose County | 3037 |
| 61 | Lyon County | 3023 |
| 62 | Keokuk County | 2980 |
| 63 | Grundy County | 2796 |
| 64 | Shelby County | 2794 |
| 65 | Hancock County | 2726 |
| 66 | Union County | 2710 |
| 67 | Jefferson County | 2687 |
| 68 | Louisa County | 2613 |
| 69 | Calhoun County | 2589 |
| 70 | Guthrie County | 2577 |
| 71 | Clarke County | 2548 |
| 72 | Lucas County | 2539 |
| 73 | Howard County | 2505 |
| 74 | Sac County | 2495 |
| 75 | Franklin County | 2485 |
| 76 | Humboldt County | 2474 |
| 77 | Mitchell County | 2470 |
| 78 | Monona County | 2357 |
| 79 | Montgomery County | 2348 |
| 80 | Winnebago County | 2328 |
| 81 | Emmet County | 2267 |
| 82 | Greene County | 2259 |
| 83 | Adair County | 2103 |
| 84 | Monroe County | 2068 |
| 85 | Van Buren County | 1898 |
| 86 | Worth County | 1830 |
| 87 | Ida County | 1827 |
| 88 | Wayne County | 1790 |
| 89 | Palo Alto County | 1752 |
| 90 | Pocahontas County | 1748 |
| 91 | Fremont County | 1707 |
| 92 | Decatur County | 1706 |
| 93 | Davis County | 1590 |
| 94 | Osceola County | 1578 |
| 95 | Taylor County | 1497 |
| 96 | Audubon County | 1430 |
| 97 | Ringgold County | 1221 |
| 98 | Adams County | 924 |