Duncannon is located in Perry county Pennsylvania with a geographic area of 0.4 square miles. The total population in Duncannon is 1,305 with 48.2% male and 51.8% female. Children under age 5 represent 5.6% of the population, under age 18 equal 19.6% of the population and over age 65 is 19.2% of the population. The median household income is $49,500, per capita income is $26,615. There are a total of 600 housing units with 52.8% owner occupied. Education includes 41.7% of residents that are high school graduates and 14.8% with a bachelor's degree or higher. The average temperature in Duncannon in the summer is 73 degrees, and in the winter 33 degrees.