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is a town in Middlesex County, Connecticut, United States. Durham is a former farming village on the Coginchaug River in central Connecticut. It has grown into a wealthy suburb due to its peaceful character and central location in the state. Every autumn, during the last weekend in September, the town hosts the wildly successful Durham Fair, the largest volunteer agricultural fair in North America. The population was 6,627 at the 2000 census.
According to the United States Census Bureau, the town has a total area of 23.8 square miles (61.5 km²), of which, 23.6 sq mi (61.1 km²) is land and 0.2 sq miles (40 ha or 0.67%) is water. Miller's Pond State Park is located within the town.
The west side of Durham is flanked by the Metacomet Ridge, a mountainous traprock ridgeline that stretches from Long Island Sound to nearly the Vermont border. Notable features of the Metacomet ridge in Durham include Trimountain, Fowler Mountain, Pistapaug Mountain, and the north tip of Totoket Mountain. The Mattabesett Trail traverses the ridge.