Monongahela, Pennsylvania, United States [City]; population was 4,928 in 1990; housing units was 2,419 in 1990; location is 40°12'N 79°55'W; land area is 1.93 square miles (1,232 acres); water area is 0.21 square miles (132 acres); FIPS code is 50408 [SourceCBP]