Andover is a Borough in Sussex County, New Jersey. Its population at the 2010 census was 606. The borough was incorporated in 1904. It has a total area of 1.5 square miles, of which 1.5 square miles is land and 0.68% is water.
U.S. Route 206 and County Route 517 serve Andover.
The economy is based on local businesses, professional services, sales and service, and production, construction and transport of materials.