The Costco membership card is non-transferable, but there are several ways to share the experience with family and friends.
Anyone with a card can bring up to two guests to the Warehouse during each visit. Keep in mind that purchasing items is exclusive to Costco members.
If you’re the Primary Member or Account Manager, you can assign your free household card to one other person in your home. That way they’ll also get the benefits of a Costco membership. To add someone, sign in and head to Account Details in your Costco.com Account. You can add a person to your household in your Account Details section, and they can pick up their card at the membership counter of your closest Costco.