Douglas County, Illinois

Douglas County, Illinois
Douglas County Courthouse and veterans' memorial
Location within the U.S. state of Illinois
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 (1.6 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.