Romeoville is located in Will county Illinois with a geographic area of 19.1 square miles. The total population in Romeoville is 39,644 with 49.4% male and 50.6% female. Children under age 5 represent 5.9% of the population, under age 18 equal 24.5% of the population and over age 65 is 10.7% of the population. The median household income is $85,888, per capita income is $28,334. There are a total of 11,675 housing units with 83.9% owner occupied. Education includes 27.0% of residents that are high school graduates and 23.8% with a bachelor's degree or higher. The average temperature in Romeoville in the summer is 74 degrees, and in the winter 27 degrees.