New London is a town in Merrimack County, New Hampshire, United States. The population was 4,397 at the 2010 census. The town is the home of Colby–Sawyer College.The town center, where 1,403 people resided at the 2010 census, is defined as the New London census-designated place, and is located on a hilltop along New Hampshire Route 114 north of Route 11 and Interstate 89.