Macon County, Illinois

Macon County, Illinois
Wabash Railroad Station and Railway Express Agency in Decatur
Official seal of Macon County, Illinois
Map of Illinois highlighting Macon County
Location within the U.S. state of Illinois
Coordinates: 39°52′N 88°58′W / 39.86°N 88.96°W / 39.86; -88.96
Country United States
State Illinois
FoundedJanuary 19, 1829
Named forNathaniel Macon
SeatDecatur
Largest cityDecatur
Government
 • County Board ChairpersonKevin Greenfield
Area
 • Total
586 sq mi (1,520 km2)
 • Land581 sq mi (1,500 km2)
 • Water5.2 sq mi (13 km2)  0.9%
Population
 (2020)
 • Total
103,998
 • Estimate 
(2025)
99,300 Decrease
 • Density179/sq mi (69.1/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional districts13th, 15th
Websitemaconcounty.illinois.gov

Macon County is a county located in the U.S. state of Illinois. According to the 2020 United States census, it had a population of 103,998. Its county seat and most populous city is Decatur.

Macon County comprises the Decatur, IL Metropolitan Statistical Area.