Andover Township is a township in Sussex County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 5,996, a decrease of 323 (−5.1%) from the 2010 census count of 6,319, which in turn reflected an increase of 286 (+4.7%) from the 6,033 counted in the 2000 census.

Fredon Township is a township in Sussex County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 3,235, a decrease of 202 (−5.9%) from the 2010 census count of 3,437, which in turn reflected an increase of 577 (+20.2%) from the 2,860 counted in the 2000 census.