Tower Hill School is ranked third in the state for the highest number of state championships for private and public schools. The school is a member of the Delaware Independent School Conference (DISC) of Wilmington and vicinity. Other member schools are St. Andrew's School, Sanford School, Tatnall School, Wilmington Christian and Wilmington Friends School. The DISC is one of the oldest competitive conferences in America. Tower Hill is also an associate member of the DIAA state organization. The Delaware Interscholastic Athletic Association governs most aspects of our athletic program from grades 7-12.