Affton, Missouri

Affton, Missouri
Unincorporated community
Census-designated place
Buildings in Affton, Missouri, October 2012
Location of Affton, Missouri
Coordinates: 38°33′00″N 90°19′35″W / 38.55000°N 90.32639°W / 38.55000; -90.32639
CountryUnited States
StateMissouri
CountySt. Louis
Area
 • Total
4.57 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)
 • Total
20,417
 • Density4,467.61/sq mi (1,724.78/km2)
Time zoneUTC-6 (Central (CST))
 • Summer (DST)UTC-5 (CDT)
ZIP code
63123
FIPS code29-00280
GNIS feature ID2393314

Affton is an unincorporated community and 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.

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