where is andover nj
Andover Township, New Jersey. Andover Township is a township in Sussex County, New Jersey, United States. As of the 2010 United States Census, the township's population was 6,319, reflecting an increase of 286 (+4.7%) from the 6,033 counted in the 2000 Census, which had in turn increased by 595 (+10.9%) from the 5,438 counted in the 1990 Census.