A list of labs that process large format film.  If anyone knows of any more, in any state, not just Illinois please let us know.  It is getting more and more difficult to find a lab to process film.

Illinois

CSW Film Systems, Inc.
215 N. Damen Ave.
Chicago, IL 60612

(312) 226-7810

Gamma
314 W. Superior St.
Chicago, IL 60610

(312) 377-0022

Website

Perfect Image
1550 S Mount Prospect Road
Des Plaines, IL 60018

(847) 297-2277

I've used them for medium format E6 and the quality is good.  Their turnaround time can be a couple days though since volume is now so low that they don't do runs every day.

Precision Imaging
2219 W. Grand Ave.
Chicago, IL. 60612

(312) 421-3338

Website