Here's a few GSD rescues in IN:
http://www.petfinder.com/shelters/IN337.html

http://www.petfinder.com/shelters/IN189.html

here's the entire list of IN shelters listed on Pet Finder.
http://www.petfinder.com/pet.cgi

You could contact Sue (Sudilar) she works with http://www.gsdrni.org/
in Northern IL.