Derry township is located in Dauphin county Pennsylvania with a geographic area of 0.8 square miles. The total population in Derry township is 1,100 with 50.3% male and 49.7% female. Children under age 5 represent 3.8% of the population, under age 18 equal 20.6% of the population and over age 65 is 18.8% of the population. The median household income is $67,440, per capita income is $32,572. There are a total of 397 housing units with 85.9% owner occupied. Education includes 42.8% of residents that are high school graduates and 21.7% with a bachelor's degree or higher. The average temperature in Derry township in the summer is 73 degrees, and in the winter 33 degrees.
