Pleasantville is a city in Atlantic County, New Jersey, United States. As of the 2010 United States Census, the city's population was 20,249, reflecting an increase of 1,237 (+6.5%) from the 19,012 counted in the 2000 Census, which had in turn increased by 2,985 (+18.6%) from the 16,027 counted in the 1990 Census.