Harrisville is a town in Cheshire County, New Hampshire, United States. Besides the town center, it also includes the village of Chesham. The population of the town was 961 at the 2010 census.Harrisville is a unique, preserved 19th-century mill town located in the Monadnock region of southern New Hampshire. There are nine bodies of water in the town, many back roads and trails to explore, and two original train depots at Harrisville and Chesham.