Mokena is located in Will county Illinois with a geographic area of 8.7 square miles. The total population in Mokena is 20,720 with 50.3% male and 49.7% female. Children under age 5 represent 5.8% of the population, under age 18 equal 22.2% of the population and over age 65 is 13.9% of the population. The median household income is $109,935, per capita income is $47,432. There are a total of 7,282 housing units with 89.1% owner occupied. Education includes 15.4% of residents that are high school graduates and 49.4% with a bachelor's degree or higher. The average temperature in Mokena in the summer is 74 degrees, and in the winter 27 degrees.