Madison County IL

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, 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.
  • Country: United States
  • State: Illinois
  • Founded: September 14, 1812
  • Named for: James Madison
  • Seat: Edwardsville
  • Largest city: Granite City
  • Congressional districts: 13th, 15th

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Data from: en.wikipedia.org