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Sappington is an unincorporated census-designated place in St. Louis County, Missouri, United States. The population was 7,580 at the 2010 census.
Sappington was named for a family of pioneer settlers.
Sappington is located at 38°31′45″N 90°22′30″W (38.529036, -90.374980).
According to the United States Census Bureau, the community has a total area of 2.6 square miles (6.7 km2), of which 0.1 square miles (0.26 km2), or 2.30%, is water.
At the 2000 census, there were 7,287 people, 3,403 households and 2,038 families living in the community. The population density was 2,850.5 per square mile (1,099.0/km2). There were 3,530 housing units at an average density of 1,380.8/sq mi (532.4/km2). The racial makeup of the community was 96.53% White, 0.64% African American, 0.11% Native American, 1.83% Asian, 0.12% from other races, and 0.77% from two or more races. Hispanic or Latino of any race were 1.03% of the population.
There were 3,403 households, of which 21.1% had children under the age of 18 living with them, 49.3% were married couples living together, 8.2% had a female householder with no husband present, and 40.1% were non-families. 36.5% of all households were made up of individuals, and 19.7% had someone living alone who was 65 years of age or older.