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Forest Lake is an unincorporated community and census-designated place (CDP) in Ela Township of Lake County, Illinois, United States. It is about 35 miles (56 km) northwest of downtown Chicago. The population was 1,659 at the 2010 census. The community was founded in 1935 as a vacation community for Chicago residents.
Forest Lake is located in southwestern Lake County at 42°12′28″N 88°3′13″W (42.207824, -88.053475). It is bordered to the north, west, and south by Hawthorn Woods, and to the east and south by Kildeer. The village of Lake Zurich boundary comes within 0.1 miles (0.16 km) of the southwest corner of the CDP.
According to the United States Census Bureau, the Forest Lake CDP has a total area of 0.42 square miles (1.1 km2), of which 0.35 square miles (0.9 km2) are land and 0.1 square miles (0.2 km2), or 14.86%, are water, consisting of the community's namesake water body.
As of the census of 2010, there were 1,659 people, 662 households, and 446 families residing in the CDP. The population density was 3,606.5 people per square mile (934.1/km2). There were 662 housing units at an average density of 1,439.1/sq mi (231.6/km2). The racial makeup of the CDP in 2016 was 89.6% White, 1.0% African American, 3.6% Asian, 0.12% from other races, and 0.5% from two or more races.