Access the Maricopa County Vendor Registration Website.


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.
Maricopa County has implemented a new Advantage Enterprise Resource Planning System which, in part, includes procurement and financial system modules. Vendor have the ability to self-maintain their business information online. The system will go live on July 6, 2016. See the Vendor Letter (PDF).

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 with your name, business name, mailing address and telephone number where you can be reached.