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St. Clair County is a county located in the western portion of the state of Missouri. Based on the 2010 census, the population was 9,805. Its county seat is Osceola. The county was organized in 1841 and named for General Arthur St. Clair, Governor of the Northwest Territory. St. Clair was also the 9th President of the United States in Congress Assembled. Under his Presidency, the Northwest Ordinance and United States Constitution were passed
Named for Arthur St. Clair, a Revolutionary War general.
County QuickFacts: CensusBureau Quick Facts
In the southwest part of the state, bounded on the north by Henry County, on the east by Benton and Hickory Counties, on the west by Bates and Vernon Counties, and on the south by Cedar and Polk Counties. Organized February 15, 1841, and named in honor of General Arthur St. Clair (1734-1818), who was of revolutionary fame. He served under Wolfe at "Quebec and was the first Governor of the Northwest Territory in 1791. In 1845, the boundary line of St. Clair County was changed to the present boundary. The territory now included in St. Clair County was attached to Rives County, now Henry County, for civil and military purposes on February 11, 1835. On May 5, 1835, the whole of St. Clair County was made a township of Rives County under the name of St. Clair Township. On November 4, 1835 Rives County Court made a change, giving St. Clair two townships naming them Weaubleau and Monegaw. In 1840, a petition was drawn up for the organization of St. Clair County into an independent municipality. (Conard's Encyclopedia of Missouri (1901), V, 424; HIST. HENRY & ST. CLAIR (1883), 836, 853, 855, 856; International Encyclopedia (1926), XX, 336)
Source: Johnson, Bernice E. "Place Names In Six Of The West Central Counties Of Missouri." M.A. thesis., University of Missouri-Columbia, 1933.
As reported by the Census Bureau, the county has a total area of 702 square miles (1,820 km2), of which 670 square miles (1,700 km2) is
land and 32 square miles (83 km2) (4.6%) is water.
Bordering counties are as follows:
Appleton City R-II School District - Appleton City
Hudson R-IX School District - Appleton City
Osceola Public Schools - Osceola
Roscoe C-1 School District - Roscoe
Lakeland R-III School District - Lowry City & Deepwater