Oak lawn is located in Cook county Illinois with a geographic area of 8.6 square miles. The total population in Oak lawn is 55,432 with 49.1% male and 50.9% female. Children under age 5 represent 6.3% of the population, under age 18 equal 21.7% of the population and over age 65 is 18.5% of the population. The median household income is $69,352, per capita income is $33,998. There are a total of 21,154 housing units with 80.2% owner occupied. Education includes 22.0% of residents that are high school graduates and 36.8% with a bachelor's degree or higher. The average temperature in Oak lawn in the summer is 74 degrees, and in the winter 27 degrees.