Costco Vendor Extranet
Costco's vendor portal, also known as Costco's Extranet, is a web based system that provides Costco vendors with access to a plethora of important information. The system is a free and secure accounting tool that allows vendors to track and maintain records of purchases and payments.
Vendor Inquiries Prospective vendors of non-food or sundry items can contact the corporate office at the addresses below. Costco's corporate mailing address is:
Vendors/Suppliers = E-mail Address © Copyright Costco Wholesale Corporation 2019
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