Round lake is located in Lake county Illinois with a geographic area of 5.6 square miles. The total population in Round lake is 18,235 with 47.5% male and 52.5% female. Children under age 5 represent 5.9% of the population, under age 18 equal 28.1% of the population and over age 65 is 9.6% of the population. The median household income is $82,550, per capita income is $33,471. There are a total of 6,073 housing units with 76.3% owner occupied. Education includes 16.4% of residents that are high school graduates and 42.3% with a bachelor's degree or higher. The average temperature in Round lake in the summer is 74 degrees, and in the winter 27 degrees.
