Woodbury is a city in Gloucester County, New Jersey, in the United States. As of the 2010 United States Census the city's population was 10,174, reflecting a decline of 133 (-1.3%) from the 10,307 counted in the 2000 Census, which had in turn declined by 597 (-5.5%) from the 10,904 counted in the 1990 Census. Woodbury is the county seat of Gloucester County.