Additionally, I have come across people in various regions of Downstate identifying with their immediate areas first (Rockford, Quad Cities, Metro East) and then a literal OTHER state before Illinois (Wisconsin, Iowa, Missouri). Not ideal, but almost impossible to change.
Not that it's a perfect map by any means (there are not more Badgers fans than Gophers fans on the Minnesota campus, haha), but that NYT fan map showing college football loyalties has some directionally correct takes, and the Illinois results are concerning, if not unexpected. Whereas programs regularly nab support from other states near the border (Tennessee fans in SW Virginia, Alabama fans in extreme NW Florida, Nebraska fans in Western Iowa, etc.), Illinois is encroached on at every border. The Illinois side of the Quad Cities has more Iowa fans. Far Northern Illinois has more Wisconsin fans. Metro East has more Mizzou fans. Southern Illinois has more Kentucky fans. The SW suburbs of Chicago have more Notre Dame fans, etc., etc. Not ideal!