Monticello is located in Piatt county Illinois with a geographic area of 3.9 square miles. The total population in Monticello is 5,815 with 48.7% male and 51.3% female. Children under age 5 represent 7.2% of the population, under age 18 equal 23.1% of the population and over age 65 is 22.1% of the population. The median household income is $76,667, per capita income is $33,845. There are a total of 2,468 housing units with 75.9% owner occupied. Education includes 29.0% of residents that are high school graduates and 38.7% with a bachelor's degree or higher. The average temperature in Monticello in the summer is 74 degrees, and in the winter 27 degrees.
