Paulsboro is a borough situated on the banks of the Delaware River within Gloucester County, in the U.S. state of New Jersey, within the Philadelphia metropolitan area. As of the 2020 United States census, the borough's population was 6,196, an increase of 99 (+1.6%) from the 6,097 recorded at the 2010 census, which in turn had reflected a decline of 63 (−1.0%) from the 6,160 counted in the 2000 census. Paulsboro and surrounding Gloucester County constitute part of South Jersey.

Gloucester County is a county in the U.S. state of New Jersey. As of the 2020 census, the county was the state's 14th-most populous county with a population of 302,294, its highest decennial count ever and an increase of 14,006 (+4.9%) from the 288,288 counted in the 2010 census, which in turn represented an increase of 33,615 (+13.2%) from the 2000 census population of 254,673. Its county seat is Woodbury. The county is part of the South Jersey region of the state.