If a customer requires documents to be served in Cook County, Illinois and wishes to use a special process server rather than the Cook County Sheriff, they must first file a court order including the special process server's information and have it accepted.
The information for the special process server in Cook County, Illinois is:
Windy City Process Serving Inc
3400 W. 111th St., #446
Chicago, IL 60655
IL license #117.001816