Hopkinton is a town in Merrimack County, New Hampshire, United States. The population was 5,589 at the 2010 census. The town has three distinct communities: Hopkinton village, mainly a residential area in the center of the town; Contoocook, the town’s business hub, located in the north; and West Hopkinton, within the more agricultural portion of the town. The town is home to the Hopkinton State Fair, adjacent to Contoocook village, and to the historic Contoocook Railroad Depot and the Contoocook Railroad Bridge, the oldest covered railroad bridge in the United States.
According to the United States Census Bureau, the town has a total area of 45.2 square miles (117.0 km), of which 43.4 square miles (112.3 km) is land and 1.8 square miles (4.6 km) is water, comprising 3.95% of the town. Hopkinton is drained by the Contoocook and Warner rivers. The highest point in town is Shaker Hill, on the border with Henniker, with an elevation of 923 feet (281 m) above sea level. Hopkinton lies fully within the Merrimack River watershed.
As of the census of 2010, there were 5,589 people, 2,204 households, and 1,631 families residing in the town. The population density was 124.7 people per square mile (48.2/km²). The racial makeup of the town was 97.7% White, 0.3% African American, 0.1% Native American, 0.6% Asian, 0.07% Pacific Islander, 0.1% from other races, and 1.2% from two or more races. Hispanic or Latino of any race were 1% of the population.
There were 2,204 households out of which 32.8% had children under the age of 18 living with them, 63.1% were married couples living together, 7% had a female householder with no husband present, and 26% were non-families. 19.6% of all households were made up of individuals living alone and 6.3% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 2.92.
In the town, the population was spread out with 25.3% under the age of 20, 3.3% from 20 to 24, 20.1% from 25 to 44, 35.2% from 45 to 64, and 16.2% who were 65 years of age or older. The median age was 45.8 years.
The median income for a household in the town was $84,911, and the median income for a family was $88,796. Males had a median income of $53,806 versus $45,656 for females. The per capita income for the town was $40,580. About 4.2% of the population was below the poverty line.