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.

Woodbury is the county seat of Gloucester County in the U.S. state of New Jersey. The city, along with the rest of Gloucester County, is part South Jersey and of the Philadelphia-Wilmington-Camden, PA-NJ-DE-MD combined statistical area, also known as the Delaware Valley or Philadelphia metropolitan area. As of the 2020 United States census, the city's population was 9,963, a decrease of 211 (−2.1%) from the 2010 census count of 10,174, which in turn reflected a decline of 133 (−1.3%) from the 10,307 in the 2000 census.