Levittown is a hamlet and census-designated place in the Town of Hempstead in Nassau County, on Long Island, in New York. It is a suburb of New York City, located halfway between the villages of Hempstead and Farmingdale. The CDP had a total population of 51,758 at the time of the 2020 census, making it the most populous unincorporated CDP in Nassau County and the second most populous CDP on Long Island, behind Brentwood.