The CFB risk game got me into spending a small amount of time on reddit's r/CFB. An intrepid set of users took a survey of fans and their county's across the U.S. and made a map.
As expected, Michigan owns much of Michigan, some Ohio, New York City and surrounds, San Francisco, and central Massachusetts for some reason, among other random counties. I thought it was pretty fun for the off-season.
Link to Map: https://i.imgur.com/8CyDLyz.png