How To Activate My Costco Credit Card

Activating your Costco Credit Card is a straightforward process that can be done through various channels. To ensure a seamless activation, follow these steps:

Activation Methods:

  1. Activation Sticker:
    • Call the number on the activation sticker attached to your card.
    • Visit the Citibank activation website indicated on the sticker.
  2. Mobile App:
    • Utilize the card issuer’s mobile app for activation.

Activation Steps:

  1. By Phone:
    • Dial 1 (855) 378-6467 or the number provided on the card’s sticker.
    • Verify personal information such as your Social Security number, card number, or the phone number linked to your application.
  2. On the Website:
    • Log in to your Citibank account or create one if needed.
    • Locate the activation page and input the necessary security details, including your card number and the last four digits of your Social Security number.
    • Follow the provided instructions to activate your Costco Credit Card.
  3. On Mobile:
    • Log in to the Citibank mobile app using your online credentials.
    • Tap the credit card activation button and input any required security information on the subsequent page.

Activation Completion:

  • Your newly activated Costco Credit Card is ready for immediate use for purchases.

Timely Activation:

  • While Citibank does not impose a specific time limit for activation, it is advisable to complete the process promptly.


  • If you encounter any issues during the activation, the Citibank customer service team is available to provide assistance. Contact them at 1 (800) 950-5114.

Ensure a hassle-free activation experience by choosing the method that suits you best.

Scroll to top