Marlborough is a town in Cheshire County, New Hampshire, United States. The population was 2,009 at the 2000 census. The town is home to the Kensan-Devan Wildlife Sanctuary at Meetinghouse Pond. The primary settlement in town, where over 54% of the population resides, is defined as the Marlborough census-designated place (CDP) and is located at the junction of New Hampshire Routes 101 and 124.