Charlestown is a town in Sullivan County, New Hampshire, United States. The population was 5,114 at the 2010 census. The town is home to Hubbard State Forest and the headquarters of the Student Conservation Association.
The area was first granted in 1735 by Colonial Governor Jonathan Belcher of Massachusetts as Plantation No. 4, the fourth in a line of forts on the Connecticut River border established as trading posts.
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