Iowa counties ranked by the lowest enrollment-weighted state-assessment proficiency. Counties need at least 3 schools and 1,000 students to qualify. The median ranked county is at 72.1%. Showing ranks 51 to 89.
| # | County | State | % Proficient |
|---|---|---|---|
| 51 | Fremont County | IA | 72.9% |
| 52 | Boone County | IA | 73.2% |
| 53 | Howard County | IA | 74.0% |
| 54 | Union County | IA | 74.0% |
| 55 | Hamilton County | IA | 74.1% |
| 56 | Carroll County | IA | 74.2% |
| 57 | Cherokee County | IA | 74.3% |
| 58 | Buchanan County | IA | 75.0% |
| 59 | Chickasaw County | IA | 75.4% |
| 60 | Harrison County | IA | 75.4% |
| 61 | Shelby County | IA | 75.6% |
| 62 | Marion County | IA | 76.1% |
| 63 | Clay County | IA | 76.6% |
| 64 | Benton County | IA | 76.7% |
| 65 | Warren County | IA | 76.8% |
| 66 | Sac County | IA | 76.9% |
| 67 | Iowa County | IA | 77.4% |
| 68 | Monroe County | IA | 77.4% |
| 69 | Madison County | IA | 77.6% |
| 70 | Butler County | IA | 77.7% |
| 71 | Mills County | IA | 78.0% |
| 72 | Poweshiek County | IA | 78.2% |
| 73 | Dickinson County | IA | 78.3% |
| 74 | Kossuth County | IA | 78.5% |
| 75 | Plymouth County | IA | 78.7% |
| 76 | Winnebago County | IA | 79.4% |
| 77 | Sioux County | IA | 79.5% |
| 78 | Story County | IA | 79.7% |
| 79 | Humboldt County | IA | 80.0% |
| 80 | Dallas County | IA | 80.4% |
| 81 | Delaware County | IA | 80.9% |
| 82 | O'Brien County | IA | 81.5% |
| 83 | Grundy County | IA | 82.0% |
| 84 | Taylor County | IA | 82.0% |
| 85 | Bremer County | IA | 82.1% |
| 86 | Mitchell County | IA | 82.4% |
| 87 | Winneshiek County | IA | 82.6% |
| 88 | Lyon County | IA | 83.1% |
| 89 | Hancock County | IA | 83.9% |