Plainfield is a town in Windham County, Connecticut, United States. The population was 14,619 at the 2000 census. The town comprises four villages: Plainfield (south, ZIP code 06374), Moosup (northeast, 06354), Wauregan (northwest, 06387), and Central Village (west, 06332). Each village has their own respective United States Post Office and fire department. The entire town is serviced by the 860 area code. Plainfield includes the Central Village Historic District, listed on the National Register of Historic Places. Plainfield is located at: 41.6775 N, 71.9220 W.