Springfield is a town in Sullivan County, New Hampshire, United States. The population was 1,311 at the 2010 census. Gile State Forest is located within the town.
According to the United States Census Bureau, the town has a total area of 44.1 square miles (114 km), of which 43.2 sq mi (112 km) is land and 0.9 sq mi (2.3 km) is water, comprising 2.02% of the town. The highest point in Springfield is the summit of Melvin Hill, at 2,303 feet (702 m) above sea level.
As of the census of 2000, there were 945 people, 386 households, and 286 families residing in the town. The population density was 21.8 people per square mile (8.4/km²). There were 534 housing units at an average density of 12.3 per square mile (4.8/km²). The racial makeup of the town was 98.84% White, 0.32% Native American, 0.21% Asian, 0.21% from other races, and 0.42% from two or more races. Hispanic or Latino of any race were 0.74% of the population.
There were 386 households out of which 30.1% had children under the age of 18 living with them, 65.3% were married couples living together, 6.2% had a female householder with no husband present, and 25.9% were non-families. 19.9% of all households were made up of individuals and 6.7% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 2.80.
In the town, the population was spread out with 23.5% under the age of 18, 4.2% from 18 to 24, 31.1% from 25 to 44, 28.8% from 45 to 64, and 12.4% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 97.3 males. For every 100 females age 18 and over, there were 96.5 males.
The median income for a household in the town was $44,659, and the median income for a family was $58,068. Males had a median income of $33,958 versus $25,223 for females. The per capita income for the town was $23,263. About 3.5% of families and 5.1% of the population were below the poverty line, including 2.4% of those under age 18 and 7.9% of those age 65 or over.