St. Louis County is a county located in the U.S. state of Missouri. Its county seat is Clayton. St. Louis County is part of the St. Louis Metro Area wherein the independent City of St. Louis and its suburbs in St. Louis County, as well as the surrounding counties in both Missouri and Illinois all together account for a total population of over 2.8 million people. St. Louis County borders the City of St. Louis, which is independent from St. Louis County. 2010 Census put the county population at 998,954—which is more than 3 times the size of its adjoining namesake city. The county was... organized in 1812 and was originally a French colonial district , named for the French King Louis IX, known as Saint Louis. Its original county seat was in various buildings including the Old Courthouse in downtown St. Louis by the Gateway Arch. In 1877, the City of St. Louis separated itself from the county, creating an independent city. The city in August 1876 narrowly approved the separation while county residents overwhelmingly opposed the separation. City residents had argued they wanted to be "rid of county taxes and state influence over county government.
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| Founded: | 1812 |
| State: | Missouri |
| Population: | 998,881 |
| Area: | 524 sq. mi. |
| Time zone: | Central Time zone |
| Also known as: | St. Louis County, Missouri, St. Louis County, St. Louis MO-IL, Metropolitan Statistical Area, Saint Louis County |