Wilton is a town in Hillsborough County, New Hampshire, United States. The population was 3,896 at the 2020 census. Like many small New England towns, it grew up around water-powered textile mills, but is now a rural bedroom community with some manufacturing and service employment. Wilton is home to the High Mowing School, a private preparatory school. The main village in town, where 1,324 people resided at the 2020 census, is defined by the U.S. Census Bureau as the Wilton census-designated place and is located near the junction of New Hampshire Routes 31 and 101, at the confluence of Stony Brook with the Souhegan River.