Thompsonville is a census-designated place (CDP) in the town of Enfield in Hartford County, Connecticut, United States. The population of the CDP was 8,577 at the 2010 census.

Enfield is a town in Hartford County, Connecticut, United States, first settled by John and Robert Pease of Salem, Massachusetts Bay Colony. The town is part of the Capitol Planning Region. The population was 42,141 at the 2020 census. It is bordered by Longmeadow, Massachusetts, and East Longmeadow, Massachusetts, to the north, Somers to the east, East Windsor and Ellington to the south, and the Connecticut River to the west.