Vendor Information

Maricopa County utilizes the Advantage Vendor Self Service System. Vendors have the ability to self-maintain their business information online.

The VSS system has been upgraded to VSS 4.0 and users now have a new and enhanced online experience. The VSS functionality remains the same and the online pages look different and are more user friendly. There is a new website address to use the VSS 4.0 system and using the Chrome browser is preferred. Your current user credentials will remain the same after the upgrade.


While the agency intends to maintain continuous access to this web site, from time to time access to information and/or documents may be interrupted or prevented either because of site problems, user problems or internet problems. Not all access difficulties can be resolved by the agency since some access failures may be due to the type of computer or communication equipment and services employed by the web site user.

Advantage Vendor Self Service

If you are trying to register as a vendor with Maricopa County and your business operates outside of the United States, please send an email to with your name, business name, mailing address and telephone number where you can be reached.