Copiague, New York, United States [CDP]; population was 20,769 in 1990; housing units was 7,067 in 1990; location is 40°40'N 73°24'W; land area is 3.19 square miles (2,044 acres); water area is 0.49 square miles (311 acres); FIPS code is 18146 [SourceCBP]