Fort Mill, South Carolina, United States [Town]; population was 4,930 in 1990; housing units was 1,989 in 1990; location is 35°0'N 80°57'W; land area is 3.12 square miles (1,994 acres); water area is 0.02 square miles (10 acres); FIPS code is 26890 [SourceCBP]