Port St. Lucie, Florida, United States [City]; population was 55,866 in 1990; housing units was 24,241 in 1990; location is 27°17'N 80°21'W; land area is 75.92 square miles (48,588 acres); water area is 1.15 square miles (735 acres); FIPS code is 58725 [SourceCBP]