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.
Hancock is the primary school district in Lemay. Hancock enrolls approximately 1600 students. Hancock High School is located at 229 West Ripa Ave. Hancock Middle School is located at 243 West Ripa Ave. Hancock Elementary School is located at 9101 South Broadway Ave. Hancock Early Childhood Center is located at 9417 South Broadway Ave.
From top left: Lemay Park, River City Casino, South Broadway, Jefferson Barracks Historic District
Location of Lemay, Missouri
|Coordinates: 38°31′57″N 90°17′7″WCoordinates: 38°31′57″N 90°17′7″W|
|• Total||4.5 sq mi (11.7 km2)|
|• Land||4.3 sq mi (11.3 km2)|
|• Water||0.2 sq mi (0.5 km2)|
||472 ft (144 m)|
|• Density||3,700/sq mi (1,400/km2)|
|Time zone||UTC-6 (Central (CST))|
|• Summer (DST)||UTC-5 (CDT)|
|GNIS feature ID||0765705|
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