MARS Collection Agency in Tulsa, OK, was established in the State of Oklahoma on August 2, 1976, and has been a successful operating collection agency since that date. We work directly with our clients, providing collection services, billing services, pre-collect letter service, and efficient transfer of accounts and paperwork. The agency offers a full line of collection services for commercial, retail, medical, government, landlord/tenant lease defaults, subrogation, telecommunications and checks