Greenville is a town in Hillsborough County, New Hampshire, United States. The population was 2,105 at the 2010 census.
It is located at the junction of New Hampshire routes 31, 45, and 123.
According to the United States Census Bureau, the town has a total area of 6.9 square miles (18 km). The Greenville CDP, which includes the town center, occupies the northern part of the town and has an area of 3.4 sq mi (8.8 km).
Greenville’s highest point is Barrett Hill, with an elevation of 1,270 feet (390 m) above sea level. The northern half of the town is drained by the Souhegan River, while the southern half is drained by tributaries of Walker Brook and Mason Brook, which flow south to the Squannacook River in Massachusetts. The entire town is within the Merrimack River watershed.
As of the census of 2010, there were 2,105 people, 861 households, and 537 families residing in the town. There were 933 housing units, of which 72, or 7.7%, were vacant. The racial makeup of the town was 97.0% white, 0.6% African American, 0.5% Native American, 0.1% Asian, 0.2% Native Hawaiian or Pacific Islander, 0.2% some other race, and 1.4% from two or more races. 2.2% of the population were Hispanic or Latino of any race.
Of the 861 households, 30.1% had children under the age of 18 living with them, 42.9% were headed by married couples living together, 13.8% had a female householder with no husband present, and 37.6% were non-families. 29.3% of all households were made up of individuals, and 10.2% were someone living alone who was 65 years of age or older. The average household size was 2.44, and the average family size was 3.02.
In the town, 23.2% of the population were under the age of 18, 8.0% were from 18 to 24, 23.3% from 25 to 44, 32.7% from 45 to 64, and 12.6% were 65 years of age or older. The median age was 41.6 years. For every 100 females, there were 98.6 males. For every 100 females age 18 and over, there were 96.7 males.
For the period 2011-2015, the estimated median annual income for a household was $52,602, and the median income for a family was $63,850. The per capita income for the town was $24,457. 13.8% of the population and 8.6% of families were below the poverty line. 24.9% of the population under the age of 18 and 11.7% of those 65 or older were living in poverty.