Decatur, Illinois

Decatur, Illinois
Nicknames: 
Soy City, Soybean Capital of the World, Limitless Decatur
Interactive map of Decatur, Illinois
Decatur
Decatur
Coordinates: 39°50′29.12″N 88°57′21.17″W / 39.8414222°N 88.9558806°W / 39.8414222; -88.9558806
Country United States
State Illinois
CountyMacon
TownshipsDecatur, Harristown, Hickory Point, Long Creek, Oakley, South Wheatland, Whitmore
Founded1823
Government
 • MayorJulie Moore Wolfe
Area
 • Total
47.79 sq mi (123.78 km2)
 • Land43.11 sq mi (111.65 km2)
 • Water4.68 sq mi (12.13 km2)  10.0%
Elevation
676 ft (206 m)
Population
 (2020)
 • Total
70,522
 • Estimate 
(2024)
68,763
 • Density1,635.9/sq mi (631.63/km2)
Time zoneUTC−5 (CST)
 • Summer (DST)EDT
ZIP Codes
62521–62523, 62526
Area codes217, 447
FIPS code17-18823
Websitedecaturil.gov

Decatur (/dɪˈktər/ dih-KAY-tər) 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 "fastest shrinking city" in Illinois. Decatur has an economy based on industrial and agricultural commodity processing and production. The city is home to Millikin University and Richland Community College.