Harding Township is a township in Morris County, in the U.S. state of New Jersey. It is located in the Passaic Valley region within the New York metropolitan area. The township was formed as a township by an act of the New Jersey Legislature on September 1, 1922, from portions of Passaic Township, based on the results of a referendum passed on May 9, 1922. As of the 2020 United States census, the township's population was 3,871, an increase of 33 (+0.9%) from the 2010 census count of 3,838, which in turn reflected an increase of 658 (+20.7%) from the 3,180 counted in the 2000 census.