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Illinois in United States with a geographic area of 57,914.0 square miles. The total population in Illinois is 12,716,164 with 49.1% male and 50.9% female. Children under age 5 represent 5.9% of the population, under age 18 equal 22.5% of the population and over age 65 is 15.7% of the population. The median household income is $68,428, per capita income is $37,306. There are a total of 4,884,061 housing units with 66.3% owner occupied. Education includes 23.2% of residents that are high school graduates and 37.7% with a bachelor's degree or higher. The average temperature in Illinois in the summer is 74 degrees, and in the winter 28 degrees.