Big rock is located in Kane county Illinois with a geographic area of 4.3 square miles. The total population in Big rock is 1,271 with 54.0% male and 46.0% female. Children under age 5 represent 6.8% of the population, under age 18 equal 24.7% of the population and over age 65 is 18.3% of the population. The median household income is $106,375, per capita income is $46,158. There are a total of 424 housing units with 88.0% owner occupied. Education includes 22.9% of residents that are high school graduates and 25.5% with a bachelor's degree or higher. The average temperature in Big rock in the summer is 74 degrees, and in the winter 27 degrees.