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St Louis County Missouri ☎ +1 314-615-5000 Last Updated: 11/20/2025 |
| St. Louis County is located in eastern Missouri. It is bounded by the City of St. Louis and the Mississippi River to the east, the Missouri River to the north, and the Meramec River to the south. As of the 2020 census, the population was 1,004,125, making it the most populous county in Missouri. Its county seat is Clayton. | |
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