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 south of Waukegan along the shore of Lake Michigan, and is a part of the Chicago metropolitan area and the North Shore. Lake Forest was founded around Lake Forest College and was laid out as a town in 1857 as a stop for travelers making their way south to Chicago. The Lake Forest City Hall, designed by Charles Sumner Frost, was completed in 1898 and originally housed the fire department, the Lake Forest Library, and city offices.