Two sources...your local Conservation Police Officer (CPO) and your district wildlife biologist. I don't know if they still have the Regional office in Bartlett, as they seem to be phasing out those offices. The number is, if it still exists: 847/608-3100. If no luck with that number, try Springfield...Wildlife: 217/782-6384, Law Enforcement: 217/782-6431.
As with everything, some CPO's and biologists will go an extra mile to help and some will just give you lip service.
Your biggest problem in finding a place to hunt in that area is that you are too close to 2/3 of the population of Illinois. People, like rats, get more aggressive as they get crowded together.
Thanks for your service, young jarhead. Semper Fi!
Semper Fi, Marines
Casey 1997-2011 RIP