4) University of Michigan
Head coach Jim Harbaugh has revitalized the proud fans of one of the most hallowed football programs in the nation. The official capacity of Michigan Stadium is listed at 107,601 attendees. Yet, somehow, an average of 110,168 fans of the maize-and-blue packed “The Big House” each Saturday in 2015. No stadium in the country had more fans attend each game than the Wolverines. Just as importantly: sales of ill-fitting khaki pants — a Harbaugh trademark — have skyrocketed around the Ann Arbor area, as the fans show their loyalty.