The Circumferential Highway goes through the town in what New Hampshire county?
Circumferential Highway (Nashua):  Most of the highway will be built in Hudson, with small sections also built through the towns of Litchfield and Merrimack as well as the city of Nashua. Litchfield, New Hampshire: Litchfield is a town in Hillsborough County, New Hampshire, United States.
Hillsborough