City (pop., 2000: 107,271), western Connecticut, U.S. Located on the Naugatuck River, Mattatuck Plantation was settled in 1674 as part of Farmington, Conn.
, and was later incorporated (1686) as the town of Waterbury. The city of Waterbury, incorporated in 1853, was consolidated with the town in 1902. In the 19th century it became the nation's largest producer of brass products. Other manufactures include clocks, watches, and chemicals. It is the financial and commercial centre of western Connecticut.