Over the past 58 seasons (1946-2003) 76 teams have won or shared in the “national championship” of Division I-A college football. Fourteen schools have won the championship or been co-champions more than once. Together they account for 60 of the 76 champion teams (78.9%).
Oklahoma (6 outright, 1 tie)
Notre Dame (5 outright, 3 ties)
Miami (4 outright, 1 tie)
Alabama (2 outright, 5 ties)
USC (3 outright, 3 ties)
Nebraska (3 outright, 2 ties)
Ohio State (2 outright, 4 ties)
Texas (2 outright, 1 tie)
Penn State, Florida State, Tennessee (2 outright each)
Michigan State (1 outright, 2 ties)
Michigan (1 outright, 1 tie)
LSU (2 ties)
Conference standings for all 76 champions and co-champions (teams included in the conference they played in during 2003):
Big 12 (11 outright, 5 ties)
SEC (6 outright, 10 ties)
Big 10 (6 outright, 9 ties)
Big East (6 outright, 1 tie)
Independent (5 outright, 3 ties)
Pac 10 (3 outright, 5 ties)
ACC (4 outright, 1 tie)
Mountain West (1 outright)
[See also here.]