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is a town in Essex County, Massachusetts, United States. It was incorporated in 1646 and as of the 2000 census population was 31,247. It is part of the Boston-Cambridge-Quincy, Massachusetts-New Hampshire metropolitan statistical area.
According to the United States Census Bureau, the town has a total area of 32.1 square miles (83.2 km
) of it (3.49%) is water. Significant water areas include the Shawsheen River and Haggetts Pond, located in west Andover, which serves as the town's reservoir. Haggetts Pond was originally set apart from other waters, but since the late 1990s has had waters added from the nearby Merrimack River to supplement the growing needs of the town.
Andover borders the following cities and towns: Lawrence, North Andover, North Reading, Wilmington, Tewksbury, Dracut and Methuen. Methuen and Dracut are opposite the Merrimack River from Andover, and are not accessible directly from Andover except by Interstate 93, which connects Andover with Methuen. Dracut is unreachable across the Merrimack.