Oak forest is located in Cook county Illinois with a geographic area of 6.0 square miles. The total population in Oak forest is 27,403 with 50.2% male and 49.8% female. Children under age 5 represent 3.9% of the population, under age 18 equal 21.3% of the population and over age 65 is 16.4% of the population. The median household income is $78,865, per capita income is $35,289. There are a total of 10,102 housing units with 81.9% owner occupied. Education includes 23.8% of residents that are high school graduates and 34.0% with a bachelor's degree or higher. The average temperature in Oak forest in the summer is 72 degrees, and in the winter 27 degrees.