Costco Customer Service
Welcome to the Costco Customer Service page. Explore our many helpful self-service options and learn more about popular topics.
Actived: Tuesday Feb 23, 2021
How can I verify my membership online?
Looking for help completing the one-time online verification process? Follow the step by step instructions below: After signing in or registering on Costco.com, click the Verify Membership link on your Account Details page to begin the one-time verification process.; Enter your Membership number.