Mason is a town in Hillsborough County, New Hampshire, United States. The population was 1,382 at the 2010 census. Mason, together with Wilton, is home to Russell-Abbott State Forest.
According to the United States Census Bureau, the town has a total area of 24.0 square miles (62.2 km), of which 23.9 square miles (62 km) is land and 0.1 square miles (0.26 km) (0.25%) is water. Mason is drained by Spaulding Brook. The town’s highest point is 1,100 feet (340 m) above sea level, on an unnamed summit near the border with Greenville.
Mason is bordered by New Ipswich and Greenville to the west, Wilton to the north, Milford to the northeast, Brookline to the east, and Ashby, Massachusetts and Townsend, Massachusetts to the south.
The town is served by state routes 31, 123 and 124.
As of the census of 2000, there were 1,147 people, 433 households, and 328 families residing in the town. The population density was 48.0 people per square mile (18.5/km²). There were 455 housing units at an average density of 19.0 per square mile (7.4/km²). The racial makeup of the town was 98.08% White, 0.17% African American, 0.09% Native American, 0.44% Asian, 0.44% Pacific Islander, and 0.78% from two or more races. Hispanic or Latino of any race were 0.96% of the population.
There were 433 households out of which 31.9% had children under the age of 18 living with them, 65.8% were married couples living together, 5.5% had a female householder with no husband present, and 24.2% were non-families. 18.0% of all households were made up of individuals and 6.2% 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 3.02.
In the town, the population was spread out with 24.3% under the age of 18, 5.5% from 18 to 24, 33.0% from 25 to 44, 28.8% from 45 to 64, and 8.5% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 106.3 males. For every 100 females age 18 and over, there were 106.7 males.
The median income for a household in the town was $60,433, and the median income for a family was $61,908. Males had a median income of $43,558 versus $26,042 for females. The per capita income for the town was $28,503. About 3.6% of families and 3.4% of the population were below the poverty line, including 3.3% of those under age 18 and 4.9% of those age 65 or over.