Levittown is a census-designated place and planned community in Bucks County, Pennsylvania, United States, within the Philadelphia metropolitan area. The population was 52,983 at the 2010 census. It is 40 feet above sea level. Though not a municipality, it is sometimes recognized as the largest suburb of Philadelphia in Pennsylvania. Starting with land purchased in 1951, it was planned and built by Levitt & Sons. The brothers Bill Levitt and architect Alfred Levitt designed its six typical houses.