Mantua Township is a township in Gloucester County, New Jersey, United States. As of the 2010 United States Census, the township's population was 15,217, reflecting an increase of 1,000 (+7.0%) from the 14,217 counted in the 2000 Census, which had in turn increased by 4,143 (+41.1%) from the 10,074 counted in the 1990 Census.Mantua Township was formed as a township by an act of the New Jersey Legislature on February 23, 1853, from portions of Greenwich Township. Portions of the township were taken to form East Greenwich Township (February 10, 1881) and Pitman (May 24, 1905). The township is named after Mantua, in Italy or for a Mantua sub-tribe of the Lenape Native Americans.GeographyAccording to the United States Census Bureau, the township had a total area of 15.919 square miles (41.228 km2), including 15.849 square miles (41.048 km2) of land and 0.070 square miles (0.180 km2) of water (0.44%).The township borders West Deptford Township, Deptford Township, Wenonah, Washington Township, Pitman, Harrison Township, and East Greenwich Township.