South Williamsport, Pennsylvania, United States [Borough]; population was 6,496 in 1990; housing units was 2,732 in 1990; location is 41°14'N 77°0'W; land area is 1.88 square miles (1,202 acres); water area is 0.24 square miles (150 acres); FIPS code is 72648 [SourceCBP]