- Islip is a town located on the south shore of Long Island in Suffolk County, New York. It is divided into several hamlets, including Great River, Islip Terrace, Oakdale, and West Sayville. Islip is known for its beautiful beaches, parks, and nature preserves. Some popular attractions in the area include Fire Island National Seashore, Heckscher State Park, and the Seatuck Environmental Association. The town also has a rich history, with landmarks such as the Islip Grange and the Bayard Cutting Arboretum. Islip is a popular destination for outdoor activities such as boating, fishing, hiking, and birdwatching.