Washington is located in Washington county Pennsylvania with a geographic area of 2.9 square miles. The total population in Washington is 13,404 with 48.5% male and 51.5% female. Children under age 5 represent 6.3% of the population, under age 18 equal 16.7% of the population and over age 65 is 15.4% of the population. The median household income is $47,771, per capita income is $23,309. There are a total of 5,695 housing units with 47.7% owner occupied. Education includes 41.2% of residents that are high school graduates and 23.6% with a bachelor's degree or higher. The average temperature in Washington in the summer is 69 degrees, and in the winter 33 degrees.