There are a few other ways you can contact Costco Credit Card customer service, too; you can submit an inquiry by mail, or visit a local Citi branch.
Here’s how you can contact Costco Credit Card customer service:
Online:Log in to your citi.com account or open the Citi Mobile App to live chat with a customer service representative
Phone Number: Call (855) 378-6467. When prompted, enter the last four digits of your Costco Credit Card number. Then, say “customer service” to connect to a customer service representative, or select an option from the menu. Live customer service representatives are available 24 hours a day, 7 days a week.
Mail: If you prefer to contact them via mail, you can do so in the following address:Citibank Customer ServiceP.O. Box 6500Sioux Falls, SD 57117
It’s worth noting that Costco Credit Card customer service is only able to answer inquiries related specifically to your Costco Credit Card account. If you have questions regarding your Costco store account, call the store’s customer service at (800) 774-2678 or visit the customer service website to live chat with a representative.
The easiest way you can make a Costco Credit Card payment is either online, or by calling customer service at (855) 378-6467. Alternatively, you can make a payment through the mobile app or via mail. There are several options, too, so you can choose whichever is most convenient. To help you make that determination, we’ll explain each payment method in more detail below.
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