Illinois has a few rust belt towns as well. Decatur is the asshole of Illinois, with a water supply to match. Though for variety, it smells like old gym socks instead. Corn processing plants are almost as bad as paper mills, and when I lived there it had two, ADM and the very aptly named Staley.
The thing about the middle of Illinois is they consider Chicago to be a separate state and East St Louis to be Missouri’s problem. “Oh you’re from Chicago” is a common reply any time you found out you’re from an exurb. Often said with just a hint of dismissal. That’s not the real Illinois. Nobody talks about Rock Island and Moline (the Illinois half of the Quad Cities) this way, for instance.
Carbondale is slightly better, but I think it’s a notorious party school for very good reasons. Small town Midwest has a saying that “there’s nothing to do here except drink, fuck, and knock over mailboxes”. Most Iowa this is especially true, but Carbondale also gave me that vibe. Also that’s a fucking long drive. St Louis too. Nobody appreciates that Illinois is half as tall as California (not that anyone appreciates how long a trip up and down CA is either).
Indiana is seriously considering annexing much of central/southern Illinois. It’s amazing just how aggressively divisive politics have become in the last 20 years.