While that’s true for many MIdwest LACs, that’s not necessarily true for all. For instance, while Oberlin is located in Ohio, the top areas which send the most students there tend to be from the coasts(NE/West Coast) and Chicago. I myself came from one of those top areas(New York).
Nowadays, it seems ~10% of Oberlin students hail from Ohio which is higher than it was when I attended back in the mid-late '90s.
The lack of in-state students attending Oberlin was considered such a big deal by the college admin around the time I graduated/not too long afterwards that they amped up initiatives to get more Ohio students to consider/choose Oberlin.