Hanover is a town located along the Connecticut River in Grafton County, New Hampshire, United States. As of the 2020 census, its population was 11,870. The town is home to Dartmouth College, the US Army Corps of Engineers Cold Regions Research and Engineering Laboratory, and Hanover High School. The Appalachian Trail crosses the town, connecting with a number of trails and nature preserves.
Most of the population resides in the Hanover census-designated place — the main village of the town. Located at the junctions of New Hampshire routes 10, 10A, and 120, the Hanover CDP recorded a population of 9,078 people at the 2020 census. The town also contains the smaller villages of Etna and Hanover Center.