Greencastle is located in Franklin county Pennsylvania with a geographic area of 1.6 square miles. The total population in Greencastle is 4,008 with 49.1% male and 50.9% female. Children under age 5 represent 10.8% of the population, under age 18 equal 24.7% of the population and over age 65 is 19.2% of the population. The median household income is $63,936, per capita income is $36,059. There are a total of 1,598 housing units with 66.7% owner occupied. Education includes 36.3% of residents that are high school graduates and 31.5% with a bachelor's degree or higher. The average temperature in Greencastle in the summer is 73 degrees, and in the winter 33 degrees.
