Andover is a town in Essex County, Massachusetts, United States. It was settled in 1642 and incorporated in 1646. As of the 2010 census, the population was 33,201. It is part of the Boston-Cambridge-Quincy, Massachusetts-New Hampshire metropolitan statistical area. Part of the town comprises the census-designated place of Andover. It is twinned with its namesake: Andover, Hampshire, England.