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is a town in Tolland County, Connecticut, United States. The population was 20,720 at the 2000 census.
The town of Mansfield contains the community of Storrs, which is home to the main campus of the University of Connecticut.
According to the United States Census Bureau, the town has a total area of 45.5 square miles (117.8 km²), of which, 44.5 square miles (115.2 km²) of it is land and 1.0 square miles (2.7 km²) of it (2.26%) is water. Mansfield Hollow Lake rests on the border between Mansfield and Willimantic.