
Gallatin County
- State:
- Illinois
- County Seat:
- Shawneetown
Gallatin County's estimated 2025 population is 4,364 with a growth rate of -3.39% in the past year according to the most recent United States census data. Gallatin County is the 99th largest county in Illinois. The 2010 population was 5,574 and has seen a growth of -21.71% since that time.