Madison County Map, Illinois

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Madison County, Illinois

Madison County sits in southwestern Illinois, right across the Mississippi River from St. Louis. Alton, the largest city, is known for its limestone bluffs and riverfront views. Manufacturing and healthcare drive the economy these days.

You’ll find a mix of farmland, forests, and communities here. Outdoor people love exploring the miles of bike trails that crisscross the area. Local festivals celebrate everything from apple orchards to barbecue.

Madison County has a little bit of everything, from lively towns like Edwardsville to miles of peaceful farmland. With the Mississippi River running along its edge, it’s a great spot for everyone to enjoy.

Category	Details
County Name	Madison County
County Seat	Edwardsville
Population	Approximately 270,000
Cities, Towns, and Communities	Alton, Granite City, Collinsville, Troy, and several unincorporated communities
Interstates and Highways	Interstate 55, Interstate 64, Interstate 270, U.S. Highway 40, U.S. Highway 67, Illinois Route 3
FIPS Code	17-119
Total Area (Land and Water)	738 square miles (land: 715 sq mi, water: 23 sq mi)
Adjacent Counties (and Direction)	Bond County (East), Clinton County (Southeast), Jersey County (Northwest), Macoupin County (North), Montgomery County (Northeast), St. Charles County, Missouri (Northwest), St. Clair County (South), St. Louis, Missouri (West), St. Louis County, Missouri (West)
Time Zone	Central Time Zone (CT)
State	Illinois
Coordinates	38.7680° N, 89.9786° W
Etymology	Named in honor of James Madison, the fourth President of the United States
Major Landmarks	The Gateway Arch (visible from parts of the county), Alton Historic District, and Cahokia Mounds
Website	Madison County Website