Ranking of Iowa Counties By White Alone Population Aged 25 years and above with an Educational attainment of Less than High School Diploma 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 Less than High School Diploma was 113,241. Among all Iowa counties, Polk County had the highest White Alone population (aged 25 years and above) with an educational attainment of Less than High School Diploma (13,086), followed by Linn County (5,646), and Pottawattamie County (5,578).
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 Less than High School Diploma in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Polk County | 13086 |
| 2 | Linn County | 5646 |
| 3 | Pottawattamie County | 5578 |
| 4 | Scott County | 4884 |
| 5 | Woodbury County | 4757 |
| 6 | Black Hawk County | 4449 |
| 7 | Dubuque County | 3560 |
| 8 | Muscatine County | 2328 |
| 9 | Marshall County | 2244 |
| 10 | Clinton County | 2191 |
| 11 | Wapello County | 2084 |
| 12 | Webster County | 1884 |
| 13 | Johnson County | 1847 |
| 14 | Des Moines County | 1694 |
| 15 | Dallas County | 1615 |
| 16 | Cerro Gordo County | 1577 |
| 17 | Lee County | 1383 |
| 18 | Marion County | 1271 |
| 18 | Story County | 1271 |
| 19 | Jasper County | 1250 |
| 20 | Warren County | 1221 |
| 21 | Buena Vista County | 1205 |
| 22 | Sioux County | 1201 |
| 23 | Davis County | 1157 |
| 24 | Boone County | 1092 |
| 25 | Clayton County | 1070 |
| 26 | Crawford County | 1023 |
| 27 | Mahaska County | 1016 |
| 28 | Washington County | 999 |
| 29 | Benton County | 979 |
| 30 | Fayette County | 947 |
| 31 | Delaware County | 930 |
| 32 | Henry County | 912 |
| 33 | Cass County | 893 |
| 34 | Allamakee County | 890 |
| 35 | Jackson County | 884 |
| 36 | Clarke County | 849 |
| 37 | Page County | 825 |
| 38 | Buchanan County | 821 |
| 38 | Tama County | 821 |
| 39 | Jefferson County | 785 |
| 40 | Harrison County | 770 |
| 41 | O'Brien County | 768 |
| 42 | Appanoose County | 765 |
| 43 | Hardin County | 749 |
| 44 | Plymouth County | 748 |
| 45 | Louisa County | 734 |
| 46 | Carroll County | 696 |
| 47 | Floyd County | 662 |
| 48 | Union County | 661 |
| 49 | Kossuth County | 639 |
| 50 | Poweshiek County | 630 |
| 51 | Jones County | 628 |
| 52 | Emmet County | 604 |
| 53 | Hancock County | 601 |
| 54 | Van Buren County | 595 |
| 55 | Hamilton County | 592 |
| 56 | Iowa County | 569 |
| 57 | Cedar County | 563 |
| 58 | Butler County | 555 |
| 59 | Montgomery County | 547 |
| 60 | Wright County | 542 |
| 61 | Bremer County | 521 |
| 62 | Howard County | 512 |
| 63 | Winneshiek County | 499 |
| 64 | Clay County | 493 |
| 65 | Mitchell County | 489 |
| 66 | Pocahontas County | 485 |
| 67 | Shelby County | 484 |
| 68 | Chickasaw County | 483 |
| 69 | Franklin County | 454 |
| 70 | Keokuk County | 452 |
| 70 | Mills County | 452 |
| 71 | Decatur County | 450 |
| 72 | Wayne County | 448 |
| 73 | Humboldt County | 435 |
| 74 | Cherokee County | 429 |
| 75 | Sac County | 428 |
| 76 | Lucas County | 422 |
| 77 | Lyon County | 418 |
| 78 | Monona County | 414 |
| 79 | Dickinson County | 405 |
| 80 | Grundy County | 388 |
| 81 | Madison County | 377 |
| 82 | Greene County | 374 |
| 83 | Osceola County | 368 |
| 83 | Palo Alto County | 368 |
| 84 | Guthrie County | 362 |
| 85 | Calhoun County | 359 |
| 86 | Worth County | 345 |
| 87 | Monroe County | 334 |
| 88 | Winnebago County | 325 |
| 89 | Audubon County | 323 |
| 90 | Ida County | 311 |
| 91 | Taylor County | 276 |
| 92 | Adair County | 244 |
| 93 | Ringgold County | 217 |
| 94 | Fremont County | 215 |
| 95 | Adams County | 145 |