Grafton is located in Jersey county Illinois with a geographic area of 3.7 square miles. The total population in Grafton is 672 with 49.3% male and 50.7% female. Children under age 5 represent 10.0% of the population, under age 18 equal 16.5% of the population and over age 65 is 33.5% of the population. The median household income is $55,625, per capita income is $37,330. There are a total of 298 housing units with 83.9% owner occupied. Education includes 40.3% of residents that are high school graduates and 26.5% with a bachelor's degree or higher. The average temperature in Grafton in the summer is 74 degrees, and in the winter 27 degrees.
