Pittsfield is a town in Merrimack County, New Hampshire, United States. The population was 4,106 at the 2010 census.
According to the United States Census Bureau, the town has a total area of 24.1 square miles (62 km), of which 23.9 sq mi (62 km) is land and 0.3 sq mi (0.78 km) is water, comprising 1.13% of the town. Pittsfield is drained by the Suncook River, part of the Merrimack River watershed. The highest point in town is the summit of Catamount Mountain, at 1,331 feet (406 m) above sea level, southeast of the town center.
As of the census of 2010, there were 4,106 people, 1,579 households, and 1,076 families residing in the town. There were 1,769 housing units, of which 190, or 10.7%, were vacant. The racial makeup of the town was 96.9% white, 0.6% African American, 0.3% Native American, 0.6% Asian, 0.0% Native Hawaiian or Pacific Islander, 0.2% some other race, and 1.4% from two or more races. 1.9% of the population were Hispanic or Latino of any race.
Of the 1,579 households, 32.8% had children under the age of 18 living with them, 50.9% were headed by married couples living together, 12.1% had a female householder with no husband present, and 31.9% were non-families. 23.4% of all households were made up of individuals, and 7.0% were someone living alone who was 65 years of age or older. The average household size was 2.57, and the average family size was 3.00.
In the town, 23.1% of the population were under the age of 18, 8.7% were from 18 to 24, 27.1% from 25 to 44, 29.6% from 45 to 64, and 11.5% were 65 years of age or older. The median age was 39.4 years. For every 100 females, there were 98.6 males. For every 100 females age 18 and over, there were 95.1 males.
For the period 2011-2015, the estimated median annual income for a household was $47,959, and the median income for a family was $63,631. The per capita income for the town was $23,910. 16.3% of the population and 14.8% of families were below the poverty line. 17.2% of the population under the age of 18 and 5.4% of those 65 or older were living in poverty.