Stark is a town in Coos County, New Hampshire, United States. The population was 556 at the 2010 census. It has a famous covered bridge. The town includes the villages of Percy and Crystal as well as the village of Stark, located on the Upper Ammonoosuc River. New Hampshire Route 110 runs through Stark, east from U.S. Highway 3 in Groveton and northwest from Route 16 in Berlin. Much of the town is within the boundaries of the White Mountain National Forest.
According to the United States Census Bureau, the town has a total area of 59.6 square miles (154 km), of which 58.7 square miles (152 km) is land and 0.9 square miles (2.3 km) is water, comprising 1.52% of the town. The town includes the eastern edge of the Pilot Range in the White Mountains, including several peaks higher than 3,000 feet (910 m) above sea level. The highest point in Stark is 3,730-foot (1,140 m) Mount Hutchins, on the border with Northumberland.
As of the census of 2000, there were 516 people, 194 households, and 147 families residing in the town. The population density was 8.7 people per square mile (3.4/km²). There were 384 housing units at an average density of 6.5 per square mile (2.5/km²). The racial makeup of the town was 97.48% White, 1.36% Asian, 0.19% from other races, and 0.97% from two or more races. Hispanic or Latino of any race were 0.39% of the population.
There were 194 households out of which 33.0% had children under the age of 18 living with them, 61.3% were married couples living together, 6.7% had a female householder with no husband present, and 24.2% were non-families. 17.5% of all households were made up of individuals and 7.7% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 2.99.
In the town, the population was spread out with 26.6% under the age of 18, 5.8% from 18 to 24, 28.5% from 25 to 44, 26.2% from 45 to 64, and 13.0% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 99.2 males. For every 100 females age 18 and over, there were 100.5 males.
The median income for a household in the town was $37,946, and the median income for a family was $40,089. Males had a median income of $35,833 versus $24,750 for females. The per capita income for the town was $17,168. About 2.5% of families and 5.1% of the population were below the poverty line, including none of those under age 18 and 6.2% of those age 65 or over.