
Hamilton County
- State:
- Illinois
- County Seat:
- McLeansboro
Hamilton County's estimated 2025 population is 7,771 with a growth rate of -0.89% in the past year according to the most recent United States census data. Hamilton County is the 89th largest county in Illinois. The 2010 population was 8,446 and has seen a growth of -7.99% since that time.