High Quality Content by WIKIPEDIA articles! Lake Forest High School, or LFHS, is a public four-year high school located in Lake Forest, Illinois, a North Shore suburb of Chicago, Illinois, in the United States. It is the only school of Lake Forest Community High School District 115, which serves the communities of Lake Forest, Lake Bluff, Knollwood, and smaller parts of Mettawa and North Chicago. It is fed by Lake Bluff Middle School, Lake Forest Country Day School, Saint Mary`s, and Deer Path Middle School.