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Lemay is a census-designated place (CDP) in south St. Louis County, Missouri, United States. The population was 16,645 at the 2010 census.
Lemay was named after Francois Lemai, who operated a ferry boat across the Meramec River in the early nineteenth century.
Lemay is located at 38°31′57″N 90°17′7″W (38.532552, -90.285332).
According to the United States Census Bureau, the CDP has a total area of 4.5 square miles (12 km2), of which 4.3 square miles (11 km2) is land and 0.2 square miles (0.52 km2), or 4.19%, is water.
At the 2000 census there were 17,215 people, 7,186 households, and 4,390 families living in the CDP. The population density was 3,959.0 people per square mile (1,528.0/km2). There were 7,580 housing units at an average density of 1,743.2/sq mi (672.8/km2). The racial makeup of the CDP was 98.51% White, 0.02% African American, 0.007% Native American, 0.53% Asian, 0.01% Pacific Islander, 0.66% from other races, and 0.96% from two or more races. Hispanic or Latino of any race were 1.03%. Of the 7,186 households 26.5% had children under the age of 18 living with them, 43.6% were married couples living together, 12.6% had a female householder with no husband present, and 38.9% were non-families. 34.3% of households were one person and 16.8% were one person aged 65 or older.