
Greene County
- State:
- Illinois
- County Seat:
- Carrollton
Greene County's estimated 2025 population is 11,349 with a growth rate of -0.85% in the past year according to the most recent United States census data. Greene County is the 85th largest county in Illinois. The 2010 population was 13,890 and has seen a growth of -18.29% since that time.