Round Lake is located in Illinois. Round Lake, Illinois has a population of 18,720. Round Lake is more family-centric than the surrounding county with 42.81% of the households containing married families with children. The county average for households married with children is 36.27%.
The median household income in Round Lake, Illinois is $86,451. The median household income for the surrounding county is $97,127 compared to the national median of $69,021. The median age of people living in Round Lake is 37 years.
The average high temperature in July is 82.2 degrees, with an average low temperature in January of 13.9 degrees. The average rainfall is approximately 36.7 inches per year, with 43.2 inches of snow per year.