Prairie grove is located in Mchenry county Illinois with a geographic area of 5.7 square miles. The total population in Prairie grove is 2,023 with 48.0% male and 52.0% female. Children under age 5 represent 5.8% of the population, under age 18 equal 23.4% of the population and over age 65 is 12.6% of the population. The median household income is $109,306, per capita income is $62,758. There are a total of 737 housing units with 90.2% owner occupied. Education includes 11.4% of residents that are high school graduates and 54.1% with a bachelor's degree or higher. The average temperature in Prairie grove in the summer is 74 degrees, and in the winter 27 degrees.