Wantagh, New York, United States [CDP]; population was 18,567 in 1990; housing units was 6,007 in 1990; location is 40°40'N 73°31'W; land area is 3.84 square miles (2,457 acres); water area is 0.30 square miles (193 acres); FIPS code is 78146 [SourceCBP]