Lake forest is located in Orange county California with a geographic area of 16.7 square miles. The total population in Lake forest is 84,666 with 48.7% male and 51.3% female. Children under age 5 represent 6.7% of the population, under age 18 equal 21.8% of the population and over age 65 is 13.5% of the population. The median household income is $112,988, per capita income is $48,474. There are a total of 29,342 housing units with 70.4% owner occupied. Education includes 10.8% of residents that are high school graduates and 54.8% with a bachelor's degree or higher. The average temperature in Lake forest in the summer is 71 degrees, and in the winter 43 degrees.