Shiloh is located in St. clair county Illinois with a geographic area of 11.0 square miles. The total population in Shiloh is 13,465 with 49.9% male and 50.1% female. Children under age 5 represent 5.5% of the population, under age 18 equal 21.3% of the population and over age 65 is 17.8% of the population. The median household income is $87,076, per capita income is $45,661. There are a total of 5,563 housing units with 68.7% owner occupied. Education includes 16.4% of residents that are high school graduates and 42.4% with a bachelor's degree or higher. The average temperature in Shiloh in the summer is 74 degrees, and in the winter 27 degrees.
