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 (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.
According to the United States Census Bureau, the town has a total area of 36.5 square miles (95 km), of which 35.7 sq mi (92 km) is land and 0.8 sq mi (2.1 km) is water, comprising 2.27% of the town. Antrim is drained by the Contoocook River and its North Branch, in addition to Great Brook. Gregg Lake and Willard Pond are in the west. Bald Mountain, elevation 2,037 feet (621 m) above sea level and the highest point in Antrim, is also in the west. Antrim lies fully within the Merrimack River watershed.
The town center, defined as a census-designated place (CDP), covers an area of 4.5 square miles (12 km), about 12% of the area of the town. It includes the main village of Antrim (once known as South Antrim or South Village), plus parts of Clinton Village and Antrim Center.
As of the census of 2010, there were 2,637 people, 1,055 households, and 727 families residing in the town. There were 1,329 housing units, of which 274, or 20.6%, were vacant. 197 of the vacant units were for seasonal or recreational use. The racial makeup of the town was 97.4% white, 0.3% African American, 0.2% Native American, 0.4% Asian, 0.04% Native Hawaiian or Pacific Islander, 0.2% some other race, and 1.6% from two or more races. 1.2% of the population were Hispanic or Latino of any race.
Of the 1,055 households, 33.2% had children under the age of 18 living with them, 53.3% were headed by married couples living together, 10.0% had a female householder with no husband present, and 31.1% were non-families. 25.1% of all households were made up of individuals, and 9.6% were someone living alone who was 65 years of age or older. The average household size was 2.48, and the average family size was 2.92.
In the town, 22.7% of the population were under the age of 18, 7.8% were from 18 to 24, 22.3% from 25 to 44, 33.8% from 45 to 64, and 13.3% were 65 years of age or older. The median age was 43.5 years. For every 100 females, there were 97.7 males. For every 100 females age 18 and over, there were 97.9 males.
For the period 2011-2015, the estimated median annual income for a household was $64,830, and the median income for a family was $77,669. Male full-time workers had a median income of $50,991 versus $36,700 for females. The per capita income for the town was $28,760. 11.0% of the population and 6.5% of families were below the poverty line. 14.3% of the population under the age of 18 and 3.0% of those 65 or older were living in poverty.