Grayslake is located in Lake county Illinois with a geographic area of 10.9 square miles. The total population in Grayslake is 20,482 with 51.5% male and 48.5% female. Children under age 5 represent 5.9% of the population, under age 18 equal 22.7% of the population and over age 65 is 11.5% of the population. The median household income is $99,583, per capita income is $46,346. There are a total of 7,686 housing units with 72.1% owner occupied. Education includes 11.7% of residents that are high school graduates and 56.8% with a bachelor's degree or higher. The average temperature in Grayslake in the summer is 74 degrees, and in the winter 27 degrees.
