Crystal Lake South High School

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1200 S Mchenry Ave
Crystal Lake, IL 60014

Crystal Lake South High School, established in 1978, is the largest school in District 155, catering to nearly 2,000 students from Crystal Lake, Lake in the Hills, and Lakewood. Recognized for its philanthropic efforts, CLS received the Outstanding Service Award in 2006 from the National Honor Society for its impactful Operation Heifer Project, raising $7,000 to support underprivileged communities globally.

Home to competitive sports teams in the Valley Division of the Fox Valley Conference, CLS has a history of success, with the Gators clinching the IHSA state title for boys' golf in 1980. With a focus on academic excellence and community service, Crystal Lake South High School continues to be a cornerstone of education and achievement in the Crystal Lake, IL area.

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