Mount Sterling
- County:
- Brown County
- County Seat:
- Yes
- Area (mi²):
- 1.108
- State:
- Illinois
Mount Sterling is a city located in Brown County, Illinois. Mount Sterling has a 2026 population of 2,031. It is also the county seat of Brown County. Mount Sterling is currently growing at a rate of 0.2% annually and its population has increased by 1.5% since the most recent census, which recorded a population of 2,001 in 2020.