Holtsville is a hamlet and census-designated place (CDP) in Suffolk County, New York, United States. The population was 19,714 at the 2010 census. Holtsville is mainly in the Town of Brookhaven, while the southwest portion is in the Town of Islip. An IRS Processing Center is located in Holtsville.

Find crucial information and trip planning details about Holtsville, which is a city in United States. The nearest major city to Holtsville is New York City. New York City, is a worth visiting city owing to its prime attractions like Empire State Building, Central Park, Statue Of Liberty. Tour packages of Holtsville are of 1 to 2 days duration.

Holtsville is an affair to remember, follow this apt itinerary of the place and return home with a bunch of memories.