Milledgeville is located in Carroll county Illinois with a geographic area of 0.7 square miles. The total population in Milledgeville is 987 with 50.1% male and 49.9% female. Children under age 5 represent 6.2% of the population, under age 18 equal 22.6% of the population and over age 65 is 25.0% of the population. The median household income is $43,661, per capita income is $30,203. There are a total of 478 housing units with 75.1% owner occupied. Education includes 41.4% of residents that are high school graduates and 12.1% with a bachelor's degree or higher. The average temperature in Milledgeville in the summer is 74 degrees, and in the winter 27 degrees.