St. Charles County MO Zip Code Map

St. Charles County is a county 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
  • Named for: Charles Borromeo
  • Seat: St. Charles
  • Largest city: O'Fallon
  • Congressional districts: 2nd, 3rd

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Data from: en.wikipedia.org