Warren Township High School District 121 is a comprehensive four-year high school with an enrollment of approximately 3,800 students.  

• The school district covers over fifty square miles and includes all or part of Beach Park, Gages Lake, Grandwood Park, Grayslake, Gurnee, Millburn, Old Mill Creek, Park City, Third Lake, Wadsworth, Waukegan and Wildwood. 

WTHS is one high school district with two campuses.  

• Each campus houses two grade levels.  
• The O'Plaine Campus generally houses 9th and 10th grades.
• The Almond Campus generally houses 11th and 12th grades.