Middlefield is a town in Middlesex County, Connecticut. The population was 4,203 at the 2000 census. The town includes the village of Rockfall.
According to the United States Census Bureau, the town has a total area of 13.3 square miles (34 km2), of which, 12.7 square miles (33 km2) of it is land and 0.6 square miles (1.6 km2) of it (4.65%) is water.
The west side of Middlefield is flanked by the Metacomet Ridge, a mountainous trap rock ridgeline that stretches from Long Island Sound to nearly the Vermont border. Notable mountains of the Metacomet Ridge in Middlefield include Higby Mountain and Besek Mountain. The 50 mile Mattabesett Trail traverses the ridge. The Nature Conservancy manages the summit and ledges of Higby Mountain.
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