Vernon is located in Marion county Illinois with a geographic area of 0.9 square miles. The total population in Vernon is 94 with 45.7% male and 54.3% female. Children under age 5 represent 2.1% of the population, under age 18 equal 11.7% of the population and over age 65 is 36.2% of the population. The median household income is $41,563, per capita income is $23,150. There are a total of 55 housing units with 76.4% owner occupied. Education includes 40.0% of residents that are high school graduates and 1.8% with a bachelor's degree or higher. The average temperature in Vernon in the summer is 74 degrees, and in the winter 27 degrees.