Antrim is a town in Hillsborough County, New Hampshire, United States. The population was 2,449 at the 2000 census. The primary settlement in the town, where over 56% of the population resides, is defined by the U.S. Census Bureau as the Antrim census-designated place (CDP) and is located at the intersection of U.S. Route 202 and New Hampshire Route 31. The town of Antrim also includes the villages of Antrim Center, North Branch, Clinton Village and South Village.