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Titusville is an unincorporated community and census-designated place (CDP) in Hopewell Township, Mercer County, in the U.S. state of New Jersey. As of the 2020 census, the population was 633. The area includes a post office with its own ZIP Code (08560), several restaurants, gas stations, a firehouse, and a small cluster of homes. Washington Crossing State Park, dedicated to George Washington's crossing of the Delaware River in 1776, is adjacent to the community.