| County | White Percentage of Total Population |
| Lyon |  99 |
| Mitchell | 99 |
| Adair | 99 |
| Grundy | 99 |
| Delaware | 99 |
| Lucas | 99 |
| Van Buren | 99 |
| Howard | 99 |
| Chickasaw | 99 |
| Davis | 98 |
| Butler | 98 |
| Keokuk | 98 |
| Dickinson | 98 |
| Ida | 98 |
| Audubon | 98 |
| Harrison | 98 |
| Sac | 98 |
| Clayton | 98 |
| Guthrie | 98 |
| Taylor | 98 |
| Shelby | 98 |
| Benton | 98 |
| Montgomery | 98 |
| Iowa | 98 |
| Ringgold | 98 |
| Adams | 98 |
| Buchanan | 98 |
| Madison | 98 |
| Wayne | 98 |
| Worth | 98 |
| Kossuth | 98 |
| Osceola | 98 |
| Humboldt | 98 |
| Hancock | 98 |
| Palo Alto | 98 |
| Greene | 98 |
| Fremont | 98 |
| Cass | 98 |
| Carroll | 98 |
| Appanoose | 98 |
| Monroe | 98 |
| Plymouth | 98 |
| Cedar | 98 |
| Mills | 98 |
| Pocahontas | 98 |
| Warren | 98 |
| Wright | 98 |
| Franklin | 98 |
| Clay | 98 |
| O'Brien | 97 |
| Sioux | 97 |
| Union | 97 |
| Jackson | 97 |
| Cherokee | 97 |
| Boone | 97 |
| Bremer | 97 |
| Washington | 97 |
| Winneshiek | 97 |
| Clarke | 97 |
| Monona | 97 |
| Winnebago | 97 |
| Calhoun | 97 |
| Fayette | 97 |
| Hardin | 97 |
| Jasper | 97 |
| Marion | 97 |
| Allamakee | 96 |
| Jones | 96 |
| Mahaska | 96 |
| Floyd | 96 |
| Cerro Gordo | 96 |
| Louisa | 96 |
| Poweshiek | 96 |
| Pottawattamie | 96 |
| Hamilton | 96 |
| Decatur | 96 |
| Muscatine | 95 |
| Crawford | 95 |
| Emmet | 95 |
| Wapello | 95 |
| Page | 95 |
| Clinton | 95 |
| Dubuque | 95 |
| Lee | 94 |
| Dallas | 94 |
| Marshall | 94 |
| Webster | 93 |
| Henry | 93 |
| Des Moines | 91 |
| Linn | 91 |
| Woodbury | 90 |
| Story | 89 |
| Tama | 89 |
| Buena Vista | 88 |
| Jefferson | 88 |
| Scott | 88 |
| Polk | 87 |
| Black Hawk | 87 |
| Johnson | 87 |