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.
According to the United States Census Bureau, the town has a total area of 25.6 square miles (66 km), of which 22.5 sq mi (58 km) is land and 3.1 sq mi (8.0 km) is water, comprising 12.04% of the town. The highest point in town is Morgan Hill, approximately 1,770 feet (540 m) above sea level.
The town is crossed by Interstate 89, which serves New London with two exits, and by New Hampshire Routes 11, 103A, and 114.
As of the census of 2010, there were 4,397 people, 1,666 households, and 1,037 families residing in the town. There were 2,303 housing units, of which 637, or 27.7%, were vacant. 521 of the vacant units were for seasonal or recreational use. The racial makeup of the town was 96.5% white, 1.1% African American, 0.05% Native American, 1.1% Asian, 0.05% Native Hawaiian or Pacific Islander, 0.1% some other race, and 1.2% from two or more races. 1.5% of the population were Hispanic or Latino of any race.
Of the 1,666 households, 18.7% had children under the age of 18 living with them, 54.8% were headed by married couples living together, 5.8% had a female householder with no husband present, and 37.8% were non-families. 33.4% of all households were made up of individuals, and 22.2% were someone living alone who was 65 years of age or older. The average household size was 2.09, and the average family size was 2.63. 912 town residents, or 20.7 of the population, lived in group quarters rather than households.
In the town, 13.3% of the population were under the age of 18, 22.6% were from 18 to 24, 10.0% from 25 to 44, 23.2% from 45 to 64, and 30.7% were 65 years of age or older. The median age was 48.7 years. For every 100 females, there were 76.2 males. For every 100 females age 18 and over, there were 71.3 males.
For the period 2011-2015, the estimated median annual income for a household was $68,981, and the median income for a family was $98,833. Male full-time workers had a median income of $57,237 versus $55,641 for females. The per capita income for the town was $35,090. 9.9% of the population and 6.4% of families were below the poverty line. 8.7% of the population under the age of 18 and 2.0% of those 65 or older were living in poverty.