| # | County | Drought Severity Index |
|---|---|---|
| 1 | Bond County | 200.0 |
| 2 | Franklin County | 200.0 |
| 3 | Jackson County | 200.0 |
| 4 | Jefferson County | 200.0 |
| 5 | Jersey County | 200.0 |
| 6 | Marion County | 200.0 |
| 7 | Perry County | 200.0 |
| 8 | Randolph County | 200.0 |
| 9 | Union County | 200.0 |
| 10 | Williamson County | 200.0 |
| 11 | Wayne County | 199.9 |
| 12 | Washington County | 199.8 |
| 13 | Clay County | 199.1 |
| 14 | Richland County | 198.5 |
| 15 | Hamilton County | 197.2 |
| 16 | Clinton County | 191.6 |
| 17 | Calhoun County | 186.8 |
| 18 | Madison County | 185.2 |
| 19 | Johnson County | 185.1 |
| 20 | Greene County | 177.3 |
| 21 | Lawrence County | 168.0 |
| 22 | Edwards County | 165.8 |
| 23 | Saline County | 158.7 |
| 24 | Fayette County | 154.2 |
| 25 | Macoupin County | 142.2 |
Source: U.S. Drought Monitor (13 October 2026). All counties with data are ranked. Estimates carry margins of error.
Citing this page: GIS Map, “Counties in the Worst Drought in Illinois”, https://gismap.land/rankings/illinois/worst-drought-counties. Figures from U.S. Drought Monitor (13 October 2026).
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