West Islip is a hamlet and CDP located in the Town of Islip in Suffolk County, New York, United States. Situated on the South Shore of Long Island, the population of the CDP was 28,335 at the time of the 2010 census.
The first people to settle in this area more than one thousand years ago were the Secatogue Indians. In the early 17th century, the West Islip area came under the influence of the Dutch. In 1664 it came under English rule when the Duke of York claimed Long Island with the permission of King Charles II.During the 19th century, the community became a popular haven of wealthy estate owners. Among these were the Magoun, Udall, Gerek and Smith families. Farming, charcoal production, lumbering and fishing were the main occupations. In the mid-19th century, the completion of the Long Island Rail Road brought travelers to West Islip and helped make the La Grange Inn a popular attraction. The inn had been established in the mid-18th century by the Higbie family.From 1940 until 1970, West Islip experienced most of its population growth. It had become an attractive suburban home community with its own fire department, post office, public library and Good Samaritan Hospital. A short drive on the Robert Moses Causeway affords access to good fishing at the Captree Boat Basin and swimming at Robert Moses State Park. West Islip boasts its own beach and marina.