Warrenton is a city in Warren County, Missouri, United States. The population was 7,880 according to the 2010 Census. It is the county seat of Warren County. Warrenton is located in the St. Louis Metropolitan Statistical Area. Warrenton's slogan is "A City for All Seasons."
Warrenton had its start in the 1830s as a planned community which was to hold the county seat. The community took its name from Warren County. A post office called Warrenton has been in operation since 1836. The Ernst Schowengerdt House and Warren County Courthouse and Circuit Court Building are listed on the National Register of Historic Places.
Warrenton is located at 38°48′57″N 91°8′25″W (38.815951, -91.140164). According to the United States Census Bureau, the city has a total area of 8.46 square miles (21.91 km²), of which, 8.37 square miles (21.68 km²) is land and 0.09 square miles (0.23 km²) is water.
As of the census of 2010, there were 7,880 people, 2,927 households, and 1,969 families residing in the city. The population density was 941.5 inhabitants per square mile (363.5/km²). There were 3,196 housing units at an average density of 381.8 per square mile (147.4/km²). The racial makeup of the city was 93.9% White, 2.1% African American, 0.6% Native American, 0.7% Asian, 0.1% Pacific Islander, 0.9% from other races, and 1.8% from two or more races. Hispanic or Latino of any race were 3.7% of the population.
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