M.A.R.S., INC. Billie Stutsman, Vice President 4530 S. Sheridan, Suite 106, ZIP 74145 Mailing Address: Box 472500, ZIP 74145 Ph: (918) 748-8444 OK I got this from www.collector.com which is ACA International. If you click on the tab labeled Resources on the top if the screen, you will see three buttons on the left hand side of the page, click agency member roster. You can check by state first. Example Michigan it will list all collection agencies in Michigan that are members of ACA. If the collection agency is not a member of ACA I don't think it will be listed. I can't vouch for the data because I did notice that ASSET ACCEPTANCE CORP had one address on www.collector.com and a different on their website. But its a start. There is an advance search also so if you have more data on the company you can search that way too. I found this website by pure research. Hope it helps someone out. Good Luck. ;~)