Chambersburg is located in Franklin county Pennsylvania with a geographic area of 6.9 square miles. The total population in Chambersburg is 21,017 with 46.8% male and 53.2% female. Children under age 5 represent 5.3% of the population, under age 18 equal 20.3% of the population and over age 65 is 19.4% of the population. The median household income is $46,924, per capita income is $27,650. There are a total of 9,235 housing units with 43.9% owner occupied. Education includes 41.8% of residents that are high school graduates and 25.8% with a bachelor's degree or higher. The average temperature in Chambersburg in the summer is 73 degrees, and in the winter 33 degrees.