Paulsboro is a borough situated on the banks of the Delaware River in 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 from the 6,097 recorded at the 2010 census, which in turn had reflected a decline of 63 from the 6,160 counted in the 2000 census. Paulsboro and surrounding Gloucester County constitute part of South Jersey.