The Southwestern Conference is a high school conference in the St. Louis Metro East area. The conference participates in athletics and activities in the IHSA Illinois High School Association. The conference comprises large public high schools in the Metro East region of suburban St. Louis. Current Membership The current group of schools have been together since O'Fallon joined in 2000. Sources:IHSA Conferences, IHSA Coop Teams, and IHSA Member Schools Directory References High school sports conferences and leagues in the United States Illinois high school sports conferences High school sports in Illinois