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Fire Island Fire Island Fire Island is the large center island of the outer barrier islands parallel to the south shore of Long Island, New York. In 2012, Hurricane Sandy once again divided Fire Island into two islands. Together, these two islands are approximately 31 miles (50 km) long and vary between 520 and 1,310 feet (160 and 400 m) wide. Fire Island is part of Suffolk County. It lies within the towns of Babylon, Islip, and Brookhaven, containing two villages and a number of hamlets. All parts of the island not within village limits are part of the Fire Island census-designated place (CDP), which had a permanent population of 292 at the 2010 census, though that expands to thousands of residents and tourists during the summer months. The land area of Fire Island is 9.6 square miles (24.9 km2).