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Mehlville is a census-designated place (CDP) in south St. Louis County, Missouri, United States, and an inner-ring suburb of St. Louis. The population was 28,380 at the 2010 census.
Mehlville is located at 38°30′15″N 90°18′46″W (38.504303, -90.312745). According to the United States Census Bureau, the CDP has a total area of 7.6 square miles (20 km2), of which 7.4 square miles (19 km2) is land and 0.2 square miles (0.52 km2), or 2.77%, is water.
At the 2000 census there were 28,822 people, 12,541 households, and 7,775 families living in the CDP. The population density was 3,913.6 people per square mile (1,512.0/km²). There were 12,982 housing units at an average density of 1,762.8/sq mi (681.0/km²). The racial makeup of the CDP was 97.08% White, 0.75% African American, 0.13% Native American, 1.77% Asian, 0.02% Pacific Islander, 0.34% from other races, and 0.61% from two or more races. Hispanic or Latino of any race were 1.45%.
There were 12,541 households, 25.9% had children under the age of 18 living with them, 48.6% were married couples living together, 10.2% had a female householder with no husband present, and 38.0% were non-families. 32.5% of households were one person and 12.7% were one person aged 65 or older.