Centralia is located in Marion county Illinois with a geographic area of 8.2 square miles. The total population in Centralia is 12,354 with 48.0% male and 52.0% female. Children under age 5 represent 7.1% of the population, under age 18 equal 24.1% of the population and over age 65 is 21.9% of the population. The median household income is $39,117, per capita income is $25,141. There are a total of 5,458 housing units with 68.2% owner occupied. Education includes 31.4% of residents that are high school graduates and 17.5% with a bachelor's degree or higher. The average temperature in Centralia in the summer is 74 degrees, and in the winter 27 degrees.
