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city, Lake county, northeastern Illinois, U.S. A suburb of Chicago, located 35 miles (55 km) north of downtown, it lies on Lake Michigan. Potawatomi Indians were recent inhabitants of the area when it was first settled in 1835, on a bluff overlooking the lake. It was named in 1855 by Presbyterian ministers who chose it as a site for a university. The city, among the first planned suburban communities in the United States, was laid out in 1857, and its wooded lakeshore became the setting for numerous estates. Special areas were reserved for the establishment of three educational institutions: Lake Forest College (opened 1857), Lake Forest Academy (1857), and Ferry Hall (1869; now a part of the academy). Also in the city are Woodlands Academy of the Sacred Heart (1858) and Lake Forest Graduate School of Management (1946). The city is largely an affluent residential suburb. Inc. 1861. Pop. (1990) 17,836; (2000) 20,059.