Marseilles is located in La salle county Illinois with a geographic area of 9.1 square miles. The total population in Marseilles is 4,579 with 49.6% male and 50.4% female. Children under age 5 represent 7.4% of the population, under age 18 equal 25.5% of the population and over age 65 is 19.2% of the population. The median household income is $51,835, per capita income is $26,182. There are a total of 1,937 housing units with 62.2% owner occupied. Education includes 36.0% of residents that are high school graduates and 18.7% with a bachelor's degree or higher. The average temperature in Marseilles in the summer is 74 degrees, and in the winter 27 degrees.
