Madison County, Illinois

Madison County
Madison County
County
	Madison County Courthouse in Edwardsville
	Location within the U.S. state of Illinois
	Illinois's location within the U.S.
	Coordinates: 38°50′N 89°55′W / 38.83°N 89.91°W
Country	United States
State	Illinois
Founded	September 14, 1812
Named for	James Madison
Seat	Edwardsville
Largest city	Granite City
Area
• Total	741 sq mi (1,920 km2)
• Land	716 sq mi (1,850 km2)
• Water	25 sq mi (60 km2) 3.4%
Population (2020)
• Total	264,776
• Density	360/sq mi (140/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional districts	13th, 15th
Website	www.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.

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