Costco account numbers are actually called Costco membership numbers. You can find yours just by flipping over your Costco membership card or your credit card with the retailer. It's printed on the back of both of these cards and clearly labeled. Your annual Costco membership renewal notice also contains your membership number.
Your Costco account number is actually called a Costco membership number, and it's pretty easy to find. All Costco membership cards have it printed on them, and the same applies for Costco Visa cards, which have the membership number printed on their back sides.
Your membership number with Costco will be a 12-digit code sometimes preceded by zeros (which you can ignore) that's printed into the back of both your Costco membership card and any Costco credit card. You can then register this number under "Account Details" when you log into your Costco membership account online.
Also remember that in the case of a Costco visa card, you'll also have a credit card number etched and printed into it. This is not the same as your Costco membership/account number.
Another place in which you can find your Costco membership number is your annual membership billing notice from Costco, which is going to either be mailed or emailed to you annually.
You can activate an online Costco account by visiting the Costco website's registration page and selecting Create Account. During this process, you'll be asked to create a password, offer up a registration email address and register your membership number as it appears on your membership card or Costco Visa card.
If you have any problems finding your Costco membership number because you've lost your cards or they're damaged, you can also visit the customer service desk at any Costco warehouse to find it. Or you can contact Costco customer support for an even more convenient way to find out what your number is or ask any other questions about your membership.
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