If you happen to have a Costco Anywhere Visa® Card by Citi, just look for your membership number on the back of the card, directly to the right of your picture., How can I contact the Costco Corporate Offices? We are happy to call Washington state our home. Visit our corporate offices at: 999 Lake Drive Issaquah, WA 98027 Or, write us at our mailing address: Costco Wholesale P.O. Box 34331 Seattle, WA 98124 Finally, feel free to call us at 425-313-8100. We’re available Monday–Friday, 8 a.m.–5 p.m. PT., There’s no limit to the annual cash back rewards you can earn on purchases with the Costco Anywhere Visa Card by Citi! Whether you’re filling your tank, dining out, travelling the world, or shopping at your favorite stores, you will earn cash back everywhere Visa is accepted., Where do I pay my credit card bill? Costco Anywhere Visa® Card by Citi payments are made directly to Citi. Here’s the contact information you’ll need. Costco Anywhere Visa® Card by Citi: www.citicards.com Consumer cards: 1-855-378-6467 Business cards: 1-855-378-6468, My Costco Anywhere Visa® Card by Citi isn’t working, what do I do? If you have received your Costco Anywhere Visa® Card by Citi but are unable to use it for purchases, it’s possible that your Costco Anywhere Visa® Card by Citi card has not yet been activated. To check, simply visit Citi here., What do I do if I have questions about my Costco Anywhere Visa® Card by Citi? Good news: Answers are just a phone call away! Please contact Citi directly using the information below: Existing Cardholders: www.citi.com Consumer cards: 1-855-378-6467 Business cards: 1-855-378-6468.