Charleston is located in Coles county Illinois with a geographic area of 8.9 square miles. The total population in Charleston is 20,141 with 47.8% male and 52.2% female. Children under age 5 represent 3.0% of the population, under age 18 equal 12.7% of the population and over age 65 is 11.7% of the population. The median household income is $41,436, per capita income is $23,901. There are a total of 7,847 housing units with 45.6% owner occupied. Education includes 21.1% of residents that are high school graduates and 34.3% with a bachelor's degree or higher. The average temperature in Charleston in the summer is 75 degrees, and in the winter 27 degrees.
