St. Charles County, Missouri

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St. Charles County is a county in the eastern part of the U.S. state of Missouri. As of the 2010 census, the population was 360,485, making it Missouri's third-most populous county. Its county seat is St. Charles.
Nearby cities:
Coordinates:   38°44'58"N   90°32'14"W
This article was last modified 7 years ago