Crystal Lake Real EstateCrystal Lake is located in Illinois. Crystal Lake, Illinois has a population of 40,331. Crystal Lake is more family-centric than the surrounding county with 39.51% of the households containing married families with children. The county average for households married with children is 37.26%. The median household income in Crystal Lake, Illinois is $83,746. The median household income for the surrounding county is $82,230 compared to the national median of $57,652. The median age of people living in Crystal Lake is 38.9 years. Crystal Lake WeatherThe average high temperature in July is 81.7 degrees, with an average low temperature in January of 11.9 degrees. The average rainfall is approximately 37 inches per year, with 35.5 inches of snow per year. Crystal Lake MapReal estate near Crystal LakeNearby CitiesNearby Cities Homes for Sale |