Affton, Missouri

Affton is a census-designated place (CDP) in south St. Louis County, Missouri, United States, near St. Louis. The population was 20,417 at the 2020 United States Census.

Affton, Missouri
Buildings in Affton, Missouri, October 2012
Location of Affton, Missouri
Coordinates: 38°33′00″N 90°19′35″W
CountryUnited States
StateMissouri
CountySt. Louis
Area
  Total4.57 sq mi (11.84 km2)
  Land4.57 sq mi (11.84 km2)
  Water0.00 sq mi (0.00 km2)
Elevation
558 ft (170 m)
Population
 (2020)
  Total20,417
  Density4,467.61/sq mi (1,724.78/km2)
Time zoneUTC-6 (Central (CST))
  Summer (DST)UTC-5 (CDT)
FIPS code29-00280
GNIS feature ID2393314
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