Cahokia is located in St. clair county Illinois with a geographic area of 9.8 square miles. The total population in Cahokia is 14,035 with 47.3% male and 52.7% female. Children under age 5 represent 7.8% of the population, under age 18 equal 32.7% of the population and over age 65 is 9.8% of the population. The median household income is $30,299, per capita income is $16,769. There are a total of 4,942 housing units with 44.0% owner occupied. Education includes 42.5% of residents that are high school graduates and 11.6% with a bachelor's degree or higher. The average temperature in Cahokia in the summer is 74 degrees, and in the winter 27 degrees.
