About Lake In The Hills, ILLake In The Hills is located in Illinois. Lake In The Hills, Illinois has a population of 28,589. Lake In The Hills is more family-centric than the surrounding county with 43% households with children. The county percentage for households with children is 34%. The median household income in Lake In The Hills, Illinois is $93,876. The median household income for the surrounding county is $83,479 compared to the national median of $61,963. The median age of people living in Lake In The Hills is 36.9 years. Lake In The Hills WeatherThe average high temperature in July is 83 degrees, with an average low temperature in January of 10.9 degrees. The annual precipitation is 37.22. Lake In The Hills MapLake In The Hills real estate officesReal estate near Lake In The HillsNearby CitiesNearby Cities Homes for Sale |