Oak brook is located in Dupage county Illinois with a geographic area of 8.0 square miles. The total population in Oak brook is 8,085 with 46.2% male and 53.8% female. Children under age 5 represent 4.5% of the population, under age 18 equal 19.4% of the population and over age 65 is 35.6% of the population. The median household income is $140,743, per capita income is $79,838. There are a total of 3,029 housing units with 96.3% owner occupied. Education includes 9.0% of residents that are high school graduates and 73.3% with a bachelor's degree or higher. The average temperature in Oak brook in the summer is 74 degrees, and in the winter 27 degrees.
