Population
| County | 1990 | 2000 | 2005 |
|---|---|---|---|
| Coles | 51644 | 53196 | 50949 |
| Christian | 34418 | 35372 | 35063 |
| Douglas | 19464 | 19922 | 19791 |
| Effingham | 31704 | 34264 | 34429 |
| Shelby | 22261 | 22893 | 22172 |
| Clark | 15921 | 17008 | 16987 |
| Cumberland | 10670 | 11253 | 11000 |
| Edgar | 19595 | 19701 | 19183 |
| Moultrie | 13930 | 14287 | 14383 |