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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.
Source: Wikipedia