Green valley is located in Pima county Arizona with a geographic area of 19.9 square miles. The total population in Green valley is 20,857 with 44.2% male and 55.8% female. Children under age 5 represent 0.1% of the population, under age 18 equal 0.8% of the population and over age 65 is 79.2% of the population. The median household income is $50,511, per capita income is $42,663. There are a total of 12,847 housing units with 85.5% owner occupied. Education includes 18.7% of residents that are high school graduates and 43.5% with a bachelor's degree or higher. The average temperature in Green valley in the summer is 83 degrees, and in the winter 49 degrees.