Wantage Township is a township in Sussex County, New Jersey, United States. As of the 2010 United States Census, the township's population was 11,358, reflecting an increase of 971 (+9.3%) from the 10,387 counted in the 2000 Census, which had in turn increased by 900 (+9.5%) from the 9,487 counted in the 1990 Census.
Wantage Township was formed as a precinct on May 30, 1754, from portions of Newton Township. It was incorporated as a Township on February 21, 1798, as part of the state's initial group of 104 townships. Boundary exchanges were made with Frankford Township in both 1826 and 1834. Portions of the township were taken on October 14, 1891, to form the Borough of Deckertown (which was renamed to Sussex borough in 1902).