Monaca, Pennsylvania, United States [Borough]; population was 6,739 in 1990; housing units was 2,772 in 1990; location is 40°41'N 80°16'W; land area is 2.08 square miles (1,334 acres); water area is 0.41 square miles (260 acres); FIPS code is 50320 [SourceCBP]