Smithton is located in St. clair county Illinois with a geographic area of 4.4 square miles. The total population in Smithton is 4,019 with 48.7% male and 51.3% female. Children under age 5 represent 3.5% of the population, under age 18 equal 22.4% of the population and over age 65 is 17.1% of the population. The median household income is $88,879, per capita income is $38,748. There are a total of 1,492 housing units with 87.2% owner occupied. Education includes 21.2% of residents that are high school graduates and 39.0% with a bachelor's degree or higher. The average temperature in Smithton in the summer is 74 degrees, and in the winter 27 degrees.
