Hanover is a town along the Connecticut River in Grafton County, New Hampshire, United States. The population was 11,260 at the 2010 census. In 2007, CNN and Money magazine rated Hanover the second best place to live in America.Dartmouth College and the US Army Corps of Engineers Cold Regions Research and Engineering Laboratory are located there. The Appalachian Trail crosses the town.The main village of the town, where 8,636 people resided at the 2010 census, is defined as the Hanover census-designated place (CDP), and is located at the junctions of New Hampshire routes 10, 10A, and 120. The town also contains the villages of Etna and Hanover Center.