Marion County Illinois Map

Marion County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 37,729. Its county seat is Salem. Marion County comprises the Centralia, IL Micropolitan Statistical Area, which is included in the St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area.
  • Country: United States
  • State: Illinois
  • Founded: 1823
  • Named for: Francis Marion
  • Seat: Salem
  • Largest city: Centralia
  • Congressional district: 15th

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Data from: en.wikipedia.org