Antrim is a town in Hillsborough County, New Hampshire, United States. The population was 2,637 at the 2010 census. The primary settlement in the town, where 1,397 people resided at the 2010 census, is defined as the Antrim census-designated place 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.