Dennisville is an unincorporated community and census-designated place (CDP) located within Dennis Township, in Cape May County, in the U.S. state of New Jersey. It is part of the Ocean City Metropolitan Statistical Area. Its postal ZIP Code is 08214.

Dennis Township is a township in Cape May County, in the U.S. state of New Jersey. The township, and all of Cape May County, is part of the South Jersey region of the state and of the Ocean City metropolitan statistical area, and is part of the Philadelphia-Wilmington-Camden, PA-NJ-DE-MD combined statistical area, also known as the Delaware Valley or Philadelphia metropolitan area. As of the 2020 United States census, the township's population was 6,285, a decrease of 182 (−2.8%) from the 2010 census count of 6,467, which in turn reflected a decline of 25 (−0.4%) from the 6,492 counted in the 2000 census.