West Chesterfield is an unincorporated community in the town of Chesterfield in Cheshire County, New Hampshire, United States. It is located north of New Hampshire Route 9 in a valley leading to the Connecticut River. Via Route 9, Keene is 14 miles to the east, and Brattleboro, Vermont, is 3 miles to the west. West Chesterfield has a separate ZIP code from the rest of Chesterfield.