Islip is a hamlet and census-designated place (CDP) that lies within the much larger Town of Islip in Suffolk County, New York. Islip is located on the south shore of Long Island, on the north side of the Great South Bay, across from Fire Island. William Nicoll, a son of New York City Mayor Matthias Nicoll, became a patentee in the 1680s of the east end of what is now the town of Islip. He accumulated over 100 square miles and named his estate Islip, after the Nicolls’ ancestral home in East Northamptonshire, England. Islip is the name of a public airport on Long Island, MacArthur Airport, however it is actually located in Ronkonkoma.
Population: 18,689
Zip Code: 16′
Area Code: 631
Elevation: 11751
