Lake forest is located in Lake county Illinois with a geographic area of 17.2 square miles. The total population in Lake forest is 19,497 with 48.2% male and 51.8% female. Children under age 5 represent 3.7% of the population, under age 18 equal 21.1% of the population and over age 65 is 24.6% of the population. The median household income is $189,118, per capita income is $98,058. There are a total of 7,203 housing units with 87.2% owner occupied. Education includes 3.7% of residents that are high school graduates and 82.7% with a bachelor's degree or higher. The average temperature in Lake forest in the summer is 69 degrees, and in the winter 27 degrees.
