Lake Forest is a city located in Lake County, Illinois, United States. As of the 2010 census it had a population of 19,375. The city is along the shore of Lake Michigan, and is a part of the Chicago metropolitan area and the North Shore.
Lake Forest was founded together with Lake Forest College; it was laid out as a town in 1857, and was a stop for travelers making their way south to Chicago. The Lake Forest City Hall, designed by Charles Sumner Frost, was completed in 1898. It originally housed the fire department, the Lake Forest Library, and city offices. The city used restrictive covenants to bar "African-Americans and Jews from purchasing property in Lake Forest", a practice that "continued at least until the 1960s", but which seems to have been "greatly diminished" by the 1990s.