Semi-interesting map of ticket buyers.
It shows two things:
1. Within big intra-state flyover rivalries, which part of which godforsaken state follows which team, and
2. Nobody gives a rat's as-s about a given college football team outside a 50-mile radius of its stadium except Notre Dame. Not even the service academies.
Measuring who watches rather than attends games would obviously be much better, but college football is still the local state fair on amphetamines. It's nothing like pro sports (I mean outside of the athlete compensation). It's demographically far more like high school sports.