Round Lake is located in Illinois. Round Lake, Illinois has a population of 18,533. Round Lake is more family-centric than the surrounding county with 49.26% of the households containing married families with children. The county average for households married with children is 38.63%.
The median household income in Round Lake, Illinois is $74,011. The median household income for the surrounding county is $82,613 compared to the national median of $57,652. The median age of people living in Round Lake is 33.6 years.
The average high temperature in July is 81.7 degrees, with an average low temperature in January of 14.6 degrees. The average rainfall is approximately 36.2 inches per year, with 39.5 inches of snow per year.