Andover, town (township), Essex county, northeastern Massachusetts, U.S. It lies in the Merrimack River valley just south of Lawrence and 20 miles (32 km) north of Boston. Settled in 1642, it was incorporated in 1646 and named for Andover, England, home of many of the early colonists.
Textile mills were established in Andover in 1813, and woolen goods are still produced. Andover is a centre for business services, trade, and the manufacture of electronic and computer systems, medical products, and chemicals. The town’s renowned Phillips Academy was founded in 1778 as one of the nation’s first boarding schools for boys; it was made coeducational in 1973 upon merging with the Abbot Academy for girls (1829). North Andover, home of Merrimack College (1947), was separated from Andover in 1855. Area 32 square miles (83 square km). Pop. (2000) 31,247; (2010) 33,201.