Belleville is located in Madison county Illinois with a geographic area of 23.2 square miles. The total population in Belleville is 41,256 with 48.2% male and 51.8% female. Children under age 5 represent 6.8% of the population, under age 18 equal 22.4% of the population and over age 65 is 13.9% of the population. The median household income is $52,843, per capita income is $27,896. There are a total of 17,824 housing units with 62.0% owner occupied. Education includes 25.1% of residents that are high school graduates and 28.5% with a bachelor's degree or higher. The average temperature in Belleville in the summer is 76 degrees, and in the winter 27 degrees.
