Gloucester City is a city in Camden County, in the U.S. state of New Jersey. As of the 2020 United States census, the city's population was 11,484, an increase of 28 (+0.2%) from the 2010 census count of 11,456, which in turn reflected a decline of 28 (−0.2%) from the 11,484 counted in the 2000 census. It is located directly across the Delaware River from Philadelphia and the Port of Philadelphia.