Derry is located in Rockingham county New hampshire with a geographic area of 16.0 square miles. The total population in Derry is 22,891 with 47.5% male and 52.5% female. Children under age 5 represent 6.1% of the population, under age 18 equal 21.2% of the population and over age 65 is 11.7% of the population. The median household income is $69,813, per capita income is $35,221. There are a total of 9,266 housing units with 58.3% owner occupied. Education includes 26.9% of residents that are high school graduates and 32.8% with a bachelor's degree or higher. The average temperature in Derry in the summer is 68 degrees, and in the winter 23 degrees.
