Crystal Lake Community (and Union School before it) served students in grades 9–12 from Crystal Lake, Cary, and the surrounding areas of McHenry County. Students in the first graduating class at Crystal Lake Community (Class of 1924) began their school year at Union School and moved to the new high school building just one month before graduation.
Crystal Lake Community High School served students from grades 9-12, encompassing areas like Crystal Lake, Cary, and surrounding parts of McHenry County. The first graduating class of Crystal Lake Community (Class of 1924) started their school year at Union School before transferring to the new high school building just a month before graduation.