National Park is a borough in Gloucester County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 3,026, a decrease of 10 from the 2010 census count of 3,036, which in turn reflected a decline of 169 from the 3,205 counted in the 2000 census. Despite its name, National Park is neither a national park nor associated with one.