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St Charles County Missouri ☎ +1 636-949-7900 Last Updated: 09/29/2026 |
| 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. Charles County is home to multinational companies including General Motors, Citi, MasterCard Worldwide and Boeing. | |
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