Grayslake is located in Illinois. Grayslake, Illinois has a population of 21,404. Grayslake is less family-centric than the surrounding county with 35% households with children. The county percentage for households with children is 35%.
The median household income in Grayslake, Illinois is $97,443. The median household income for the surrounding county is $91,525 compared to the national median of $66,222. The median age of people living in Grayslake is 39.4 years.
The average high temperature in July is 82.2 degrees, with an average low temperature in January of 12.1 degrees. The annual precipitation is 35.5.