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Islip is a town located in Suffolk County on the southern shore of Long Island, New York. With an estimated population of around 325,000 in 2025, Islip is one of the largest towns in the state by population. It stretches from the Great South Bay on the south to the Long Island Expressway in the north, bordered by Babylon to the west and Brookhaven to the east. The town features a mix of suburban neighborhoods, beaches, marinas, and natural preserves. Islip includes several hamlets and villages such as Bay Shore, Brentwood, Central Islip, and Sayville. The terrain is mostly flat, with sandy soil and low-lying wetlands near the coast. The area enjoys a humid subtropical climate, with warm summers reaching average highs of around 84°F, and cold winters with lows averaging 26°F. Annual precipitation averages 44 inches, and coastal breezes often moderate extreme temperatures.

Demographically, Islip showcases considerable diversity, reflecting both long-standing suburban roots and growing immigrant communities. The population is approximately 48% White, 20% Hispanic or Latino, 17% Black or African American, and 5% Asian, along with other multiracial groups. Nearly 30% of residents are foreign-born, and the town has a median age of about 38 years. The median household income is roughly $88,000, though socioeconomic variation exists across different neighborhoods. With a population density of around 3,200 people per square mile, Islip strikes a balance between suburban spaciousness and urban accessibility. Household types are diverse, including family households, single-parent families, and a growing number of multi-generational and single-person households. The community benefits from proximity to the Long Island Rail Road, major highways, and MacArthur Airport, making Islip both a residential hub and a gateway to the greater New York metropolitan area.