Glen ellyn is located in Dupage county Illinois with a geographic area of 6.9 square miles. The total population in Glen ellyn is 27,741 with 49.1% male and 50.9% female. Children under age 5 represent 6.5% of the population, under age 18 equal 26.6% of the population and over age 65 is 17.8% of the population. The median household income is $118,208, per capita income is $65,328. There are a total of 10,747 housing units with 76.9% owner occupied. Education includes 10.5% of residents that are high school graduates and 66.0% with a bachelor's degree or higher. The average temperature in Glen ellyn in the summer is 74 degrees, and in the winter 27 degrees.