Illinois counties ranked by the highest county-wide student-to-teacher ratio. Counties need at least 3 schools and 1,000 students to qualify. The median ranked county is at 13.1:1. Showing ranks 51 to 89.
| # | County | State | Ratio |
|---|---|---|---|
| 51 | Jackson County | IL | 12.9:1 |
| 52 | Lake County | IL | 12.9:1 |
| 53 | Lawrence County | IL | 12.9:1 |
| 54 | Carroll County | IL | 12.8:1 |
| 55 | Mercer County | IL | 12.8:1 |
| 56 | Franklin County | IL | 12.7:1 |
| 57 | Montgomery County | IL | 12.7:1 |
| 58 | Pike County | IL | 12.7:1 |
| 59 | Jefferson County | IL | 12.6:1 |
| 60 | Morgan County | IL | 12.6:1 |
| 61 | LaSalle County | IL | 12.5:1 |
| 62 | Washington County | IL | 12.5:1 |
| 63 | Marion County | IL | 12.4:1 |
| 64 | Piatt County | IL | 12.4:1 |
| 65 | Wayne County | IL | 12.4:1 |
| 66 | Bond County | IL | 12.3:1 |
| 67 | Menard County | IL | 12.3:1 |
| 68 | Union County | IL | 12.3:1 |
| 69 | Fayette County | IL | 12.2:1 |
| 70 | Logan County | IL | 12.1:1 |
| 71 | Shelby County | IL | 12.1:1 |
| 72 | Crawford County | IL | 12.0:1 |
| 73 | Douglas County | IL | 12.0:1 |
| 74 | Hancock County | IL | 12.0:1 |
| 75 | Bureau County | IL | 11.8:1 |
| 76 | Clay County | IL | 11.8:1 |
| 77 | Saline County | IL | 11.8:1 |
| 78 | De Witt County | IL | 11.7:1 |
| 79 | Fulton County | IL | 11.7:1 |
| 80 | Marshall County | IL | 11.7:1 |
| 81 | McDonough County | IL | 11.7:1 |
| 82 | Massac County | IL | 11.6:1 |
| 83 | Ford County | IL | 11.5:1 |
| 84 | Iroquois County | IL | 11.5:1 |
| 85 | Mason County | IL | 11.3:1 |
| 86 | Greene County | IL | 11.1:1 |
| 87 | Livingston County | IL | 11.1:1 |
| 88 | Edgar County | IL | 11.0:1 |
| 89 | Jo Daviess County | IL | 11.0:1 |