Decatur is the largest city in Macon County, Illinois, United States, and its county seat. The city was founded in 1829 and is situated along the Sangamon River and Lake Decatur in Central Illinois. As of the 2020 census, it had a population of 70,522. It is the 17th-most populous city in Illinois and the sixth-most populous outside the Chicago metropolitan area. Decatur has an economy based on industrial and agricultural commodity processing and production. The city is home to Millikin University and Richland Community College.
Country: United States
State: Illinois
County: Macon
Founded: 1823
Elevation: 677 ft (206 m)
Area codes: 217, 447
Townships: Decatur, Harristown, Hickory Point, Long Creek, Oakley, South Wheatland, Whitmore
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