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Andover is a borough in Sussex County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 595, a decrease of 11 (−1.8%) from the 2010 census count of 606, which in turn reflected a decline of 52 (−7.9%) from the 658 counted in the 2000 census. Andover was incorporated as a borough by an act of the New Jersey Legislature on March 25, 1904, from portions of Andover Township. The borough was named for Andover Township, which was in turn named for Andover, Hampshire, England. == Geography == According to the United States Census Bureau, the borough had a total area of 1.36 square miles (3.53 km2), including 1.35 square miles (3.49 km2) of land and 0.02 square miles (0.04 km2) of water (1.18%).