DeWitt County, Illinois

DeWitt County, Illinois
Location within the U.S. state of Illinois
Coordinates: 40°10′29″N 88°54′15″W / 40.17463°N 88.90409°W / 40.17463; -88.90409
Country United States
State Illinois
Founded1839
Named afterDeWitt Clinton
SeatClinton
Largest cityClinton
Area
 • Total
405 sq mi (1,050 km2)
 • Land398 sq mi (1,030 km2)
 • Water7.6 sq mi (20 km2)  1.9%
Population
 (2020)
 • Total
15,516
 • Estimate 
(2024)
15,319
 • Density39.0/sq mi (15.1/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district15th
Websitewww.dewittcountyil.gov

DeWitt County is a county located in the U.S. state of Illinois. As of the 2020 United States census, the population was 15,516. Its county seat is Clinton. The county was formed as De Witt County on March 1, 1839, from Macon and McLean counties. The county was named in honor of the seventh Governor of New York State, De Witt Clinton.

DeWitt County is included in Bloomington–Normal, IL Metropolitan Statistical Area.

The U.S. Census Bureau and the U.S. Geological Survey (USGS) list the county's name as De Witt, although the county uses the name DeWitt (no space).