According to multiple sources, including NCAA.com, Wikipedia, Statista, AthlonSports.com, and 247Sports, the biggest college football stadium in the United States is Michigan Stadium, located in Ann Arbor, Michigan. It has a seating capacity of 107,601. The second-largest stadium is Beaver Stadium, located in University Park, Pennsylvania, with a seating capacity of 106,572. The third-largest stadium is Ohio Stadium, located in Columbus, Ohio, with a seating capacity of 102,780. Here is a list of the top 10 largest-capacity college football stadiums according to NFL.com:

1. Michigan Stadium (Michigan) - 107,601
2. Beaver Stadium (Penn State) - 106,572
3. Ohio Stadium (Ohio State) - 102,780
4. Kyle Field (Texas A&M) - 102,733
5. Tiger Stadium (LSU) - 102,321
6. Neyland Stadium (Tennessee) - 102,455
7. Bryant-Denny Stadium (Alabama) - 101,821
8. Darrell K Royal-Texas Memorial Stadium (Texas) - 100,119
9. Sanford Stadium (Georgia) - 92,746
10. Rose Bowl (UCLA) - 91,136

Therefore, Michigan Stadium is the biggest college football stadium in the United States.