Thornton is located in Cook county Illinois with a geographic area of 2.4 square miles. The total population in Thornton is 2,308 with 48.0% male and 52.0% female. Children under age 5 represent 3.1% of the population, under age 18 equal 15.9% of the population and over age 65 is 16.5% of the population. The median household income is $66,447, per capita income is $32,251. There are a total of 960 housing units with 76.3% owner occupied. Education includes 46.6% of residents that are high school graduates and 14.6% with a bachelor's degree or higher. The average temperature in Thornton in the summer is 74 degrees, and in the winter 27 degrees.