
Brown County
- State:
- Illinois
- County Seat:
- Mount Sterling
Brown County's estimated 2025 population is 6,250 with a growth rate of -0.35% in the past year according to the most recent United States census data. Brown County is the 91st largest county in Illinois. The 2010 population was 6,919 and has seen a growth of -9.67% since that time.