St. Charles County MO Map

St. Charles County is located in the central eastern part of the U.S. state of Missouri. As of the 2020 census, the population was 405,262, making it Missouri's third-most populous county. Its county seat is St. Charles. The county was organized October 1, 1812, and named for Saint Charles Borromeo, an Italian cardinal.
  • Country: United States
  • State: Missouri
  • Founded: October 1, 1812
  • Seat: St. Charles
  • Largest city: O'Fallon
  • Congressional districts: 2nd, 3rd
  • Time zone: UTC−6 (Central)

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Data from: en.wikipedia.org