Brown County, Illinois

Brown County
Brown County Courthouse in Mount Sterling
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 39°57′N 90°45′W / 39.95°N 90.75°W / 39.95; -90.75
Country United States
State Illinois
Founded1839
Named afterJacob Brown
SeatMount Sterling
Largest cityMount Sterling
Area
  Total
307 sq mi (800 km2)
  Land306 sq mi (790 km2)
  Water1.6 sq mi (4 km2)  0.5%
Population
 (2020)
  Total
6,244
  Estimate 
(2023)
6,294
  Density20/sq mi (7.9/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district15th
Websitehttps://www.browncoil.org

Brown County is a county located in the U.S. state of Illinois. As of the 2020 census, the population was 6,244. Its county seat is Mount Sterling. Siloam Springs State Park is located partly in this county.