Northumberland is located in Coos county New hampshire with a geographic area of square miles. The total population in Northumberland is 1,900 with 48.8% male and 51.2% female. Children under age 5 represent 7.1% of the population, under age 18 equal 19.4% of the population and over age 65 is 24.3% of the population. The median household income is $47,596, per capita income is $25,784. There are a total of 850 housing units with 73.5% owner occupied. Education includes 50.2% of residents that are high school graduates and 13.2% with a bachelor's degree or higher. The average temperature in Northumberland in the summer is 68 degrees, and in the winter 23 degrees.
