South El Monte, California, United States [City]; population was 20,850 in 1990; housing units was 4,867 in 1990; location is 34°3'N 118°3'W; land area is 2.89 square miles (1,852 acres); water area is 0.01 square miles (9 acres); FIPS code is 72996 [SourceCBP]