Question: Can I Use American Express at Costco?

Answer: No, you can not use American Express credit card at Costco.  You can only use Visa credit cards.  Costco switched from American Express Credit Card to Visa as exclusive credit card payment on June 20, 2016.

Before June 20, 2016, you could only use American Express credit cards.  After June 20, 2016, you could only use Visa credit cards, along with cash, checks, debit and ATM cards, Electronic benefit transfer (EBT) and Costco Cash cards.

Costco Credit Cards are issued by Citibank.