Holderness is a town in Grafton County, New Hampshire, United States. The population was 2,108 at the 2010 census. An agricultural and resort area, Holderness is home to the Squam Lakes Natural Science Center and is located on Squam Lake. Holderness is also home to Holderness School, a co-educational college-preparatory boarding school.
According to the United States Census Bureau, the town has a total area of 35.6 square miles (92 km), of which 30.4 sq mi (79 km) is land and 5.2 sq mi (13 km) is water, comprising 14.73% of the town. Bounded on the northwest by the Pemigewasset River, Holderness is drained by Owl Brook. Part of Squam Lake is in the east, and Little Squam Lake is in the center. Mount Prospect, with an elevation of 2,064 feet (629 m) above sea level, is in the north. Also in the north is the highest point in Holderness, Mount Webster, elevation 2,076 feet (633 m) and part of the Squam Range. Holderness lies fully within the Merrimack River watershed.
The town is served by U.S. Route 3 and state routes 25, 113 and 175.
As of the census of 2000, there were 1,930 people, 768 households, and 546 families residing in the town. The population density was 63.5 people per square mile (24.5/km²). There were 1,208 housing units at an average density of 39.8 per square mile (15.4/km²). The racial makeup of the town was 97.88% White, 0.47% African American, 0.05% Native American, 0.36% Asian, 0.10% from other races, and 1.14% from two or more races. Hispanic or Latino of any race were 0.41% of the population.
There were 768 households out of which 30.7% had children under the age of 18 living with them, 61.2% were married couples living together, 5.9% had a female householder with no husband present, and 28.9% were non-families. 21.5% of all households were made up of individuals and 7.3% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 2.91.
In the town, the population was spread out with 24.4% under the age of 18, 6.9% from 18 to 24, 24.5% from 25 to 44, 31.4% from 45 to 64, and 12.8% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 95.9 males. For every 100 females age 18 and over, there were 98.8 males.
The median income for a household in the town was $47,895, and the median income for a family was $55,526. Males had a median income of $36,500 versus $26,116 for females. The per capita income for the town was $27,825. About 2.8% of families and 4.9% of the population were below the poverty line, including 9.2% of those under age 18 and 4.0% of those age 65 or over.
Holderness New Hampshire neighborhoods include: Holderness/ N. Meredith, Holderness Plymouth