Madison County, Illinois

Madison County
Madison County Courthouse in Edwardsville
Madison County Courthouse in Edwardsville
Map of Illinois highlighting Madison County
Location within the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Coordinates: 38°50′N 89°55′W / 38.83°N 89.91°W / 38.83; -89.91
Country United States
State Illinois
FoundedSeptember 14, 1812
Named forJames Madison
SeatEdwardsville
Largest cityGranite City
Area
 • Total741 sq mi (1,920 km2)
 • Land716 sq mi (1,850 km2)
 • Water25 sq mi (60 km2)  3.4%
Population
 (2020)
 • Total264,776
 • Estimate 
(2023)
262,752 Decrease
 • Density360/sq mi (140/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional districts13th, 15th
Websitewww.madisoncountyil.gov

Madison County is a county in the U.S. state of Illinois. It is a part of the Metro East in southern Illinois. According to the 2020 census, it had a population of 264,776,[1] making it the eighth-most populous county in Illinois and the most populous in the southern portion of the state. The county seat is Edwardsville, and the largest city is Granite City.[2]

Madison County is part of the Metro East region of Greater St. Louis. The pre-Columbian city of Cahokia Mounds, a World Heritage Site, was located near Collinsville. Edwardsville is home to Southern Illinois University Edwardsville. To the north, Alton is known for its abolitionist and American Civil War-era history. It is also the home of the Southern Illinois University School of Dental Medicine. Godfrey, the village named for Captain Benjamin Godfrey, offers Lewis and Clark Community College formerly the Monticello Female Seminary.

  1. ^ "Explore Census Data". data.census.gov. Retrieved May 29, 2021.
  2. ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.