I'm in Illinois also. I have searched the secretary of states website for the registered agents of each CRA. I have found nothing. I even e-mailed them and asked. Their reply was: I don't show listings in our database for any of the credit bureaus below. You might try the Department of Banks & Real Estate or the Department of Professional Regulation. Department of Professional Regulations is for collection agencies. I have already checked. So, has anyone sued TU, EX. or CSC in Illinois and could they provide me with a registered agent. this is the link that I have been using, but I get no definitive answer from it or from the SOS either. http://www.cyberdriveillinois.com/cgi-bin/business_services/corpsrch.s