| Population | County | % Correct |
|---|---|---|
| 490,161 | Polk | 100%
|
| 226,706 | Linn | 79%
|
| 172,943 | Scott | 79%
|
| 131,228 | Black Hawk | 74%
|
| 151,140 | Johnson | 74%
|
| 103,107 | Woodbury | 68%
|
| 97,311 | Dubuque | 63%
|
| 93,453 | Dallas | 58%
|
| 93,206 | Pottawattamie | 58%
|
| 97,117 | Story | 58%
|
| 42,450 | Cerro Gordo | 53%
|
| 46,429 | Clinton | 53%
|
| 37,185 | Jasper | 53%
|
| 39,369 | Marshall | 53%
|
| 42,664 | Muscatine | 53%
|
| 34,969 | Wapello | 53%
|
| 51,466 | Warren | 53%
|
| 35,904 | Webster | 53%
|
| 38,967 | Des Moines | 47%
|
| 33,657 | Lee | 47%
|
| 25,645 | Benton | 42%
|
| 26,234 | Boone | 42%
|
| 25,062 | Bremer | 42%
|
| 33,253 | Marion | 42%
|
| 25,068 | Plymouth | 42%
|
| 34,827 | Sioux | 42%
|
| 3,670 | Adams | 37%
|
| 13,813 | Allamakee | 37%
|
| 5,571 | Audubon | 37%
|
| 21,118 | Buchanan | 37%
|
| 20,165 | Carroll | 37%
|
| 16,016 | Clay | 37%
|
| 17,625 | Clayton | 37%
|
| 8,920 | Davis | 37%
|
| 6,901 | Ida | 37%
|
| 19,401 | Jackson | 37%
|
| 14,978 | Kossuth | 37%
|
| 22,095 | Mahaska | 37%
|
| 7,807 | Monroe | 37%
|
| 6,052 | Osceola | 37%
|
| 6,797 | Pocahontas | 37%
|
| 4,964 | Ringgold | 37%
|
| 17,032 | Tama | 37%
|
| 6,167 | Taylor | 37%
|
| 12,358 | Union | 37%
|
| 7,150 | Van Buren | 37%
|
| 6,429 | Wayne | 37%
|
| 20,262 | Winneshiek | 37%
|
| 7,085 | Adair | 32%
|
| 12,452 | Appanoose | 32%
|
| 19,620 | Buena Vista | 32%
|
| 14,628 | Butler | 32%
|
| 9,744 | Calhoun | 32%
|
| 13,091 | Cass | 32%
|
| 18,457 | Cedar | 32%
|
| 11,343 | Cherokee | 32%
|
| 12,026 | Chickasaw | 32%
|
| 9,360 | Clarke | 32%
|
| 17,034 | Crawford | 32%
|
| 7,979 | Decatur | 32%
|
| 17,183 | Delaware | 32%
|
| 17,258 | Dickinson | 32%
|
| 9,438 | Emmet | 32%
|
| 19,803 | Fayette | 32%
|
| 15,786 | Floyd | 32%
|
| 10,162 | Franklin | 32%
|
| 6,946 | Fremont | 32%
|
| 8,950 | Greene | 32%
|
| 12,232 | Grundy | 32%
|
| 10,689 | Guthrie | 32%
|
| 14,997 | Hamilton | 32%
|
| 10,802 | Hancock | 32%
|
| 17,061 | Hardin | 32%
|
| 14,049 | Harrison | 32%
|
| 19,941 | Henry | 32%
|
| 9,226 | Howard | 32%
|
| 9,554 | Humboldt | 32%
|
| 16,189 | Iowa | 32%
|
| 18,295 | Jefferson | 32%
|
| 20,681 | Jones | 32%
|
| 10,188 | Keokuk | 32%
|
| 11,178 | Louisa | 32%
|
| 8,583 | Lucas | 32%
|
| 11,776 | Lyon | 32%
|
| 16,338 | Madison | 32%
|
| 15,109 | Mills | 32%
|
| 10,608 | Mitchell | 32%
|
| 8,730 | Monona | 32%
|
| 10,053 | Montgomery | 32%
|
| 13,835 | O'Brien | 32%
|
| 15,268 | Page | 32%
|
| 9,003 | Palo Alto | 32%
|
| 18,388 | Poweshiek | 32%
|
| 9,802 | Sac | 32%
|
| 11,606 | Shelby | 32%
|
| 21,965 | Washington | 32%
|
| 10,534 | Winnebago | 32%
|
| 7,381 | Worth | 32%
|
| 12,739 | Wright | 32%
|