Douglas County, Illinois

Douglas County
Douglas County Courthouse and veterans' memorial
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 39°46′N 88°13′W / 39.77°N 88.22°W / 39.77; -88.22
Country United States
State Illinois
Founded1859
Named afterStephen A. Douglas
SeatTuscola
Largest cityTuscola
Area
  Total
417 sq mi (1,080 km2)
  Land416 sq mi (1,080 km2)
  Water0.6 sq mi (2 km2)  0.1%
Population
 (2020)
  Total
19,740
  Estimate 
(2024)
19,824
  Density47.7/sq mi (18.4/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district15th
Websitedouglascountyil.gov

Douglas County is a county located in the U.S. state of Illinois. As of the 2020 United States census, the population was 19,740. The county seat is Tuscola.