Mastic, New York, United States [CDP]; population was 13,778 in 1990; housing units was 4,234 in 1990; location is 40°48'N 72°51'W; land area is 4.44 square miles (2,839 acres); water area is 0.34 square miles (218 acres); FIPS code is 46074 [SourceCBP]