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Islip

1. Islip, New York, United States [CDP]; population was 18,924 in 1990; housing units was 6,458 in 1990; location is 40°44'N 73°13'W; land area is 5.40 square miles (3,455 acres); water area is 0.36 square miles (227 acres); FIPS code is 37869 [SourceCBP]
2. Islip, New York, United States [Populated Place] is in Suffolk County; location is 40°43'47"N 73°12'39"W; elevation is 16 feet [SourceGSP]
3. Islip, New York, United States Postal Service Zip Code is 11751 [SourcePSZ]