Lewistown is located in Fulton county Illinois with a geographic area of 2.0 square miles. The total population in Lewistown is 2,021 with 50.3% male and 49.7% female. Children under age 5 represent 5.2% of the population, under age 18 equal 20.4% of the population and over age 65 is 20.3% of the population. The median household income is $52,393, per capita income is $27,272. There are a total of 841 housing units with 68.0% owner occupied. Education includes 40.7% of residents that are high school graduates and 15.9% with a bachelor's degree or higher. The average temperature in Lewistown in the summer is 74 degrees, and in the winter 27 degrees.