Southern Careers Institute’s Campus of Waco: You’ll Leave With the Hands-On Training and Certifications You Need to Compete in Waco, Texas! The Southern Careers Institute in Waco is conveniently located just minutes south of Downtown Waco, the county seat of McLennan County. While this campus is located in the city, it still has the supportive, family-like environment that Southern Careers Institute is known for. SCI’s college in Waco, Texas offers Medical Billing and Coding, Medical Office Specialist, and Medical Assistant. SCI’s Waco Campus The Waco Southern Careeers Institute campus is located in central Waco.