Welcome to the Costco Customer Service page. Explore our many helpful self-service options and learn more about popular topics.

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.

Welcome to the Costco Customer Service page. Explore our many helpful self-service options and learn more about popular topics.

Welcome to the Costco Customer Service page. Explore our many helpful self-service options and learn more about popular topics.

Welcome to the Costco Customer Service page. Explore our many helpful self-service options and learn more about popular topics.

Welcome to the Costco Customer Service page. Explore our many helpful self-service options and learn more about popular topics.

Costco adheres to all state laws regarding what can be purchased with EBT cards. For a complete list of products that qualify for purchase with the EBT card, please contact your state agency. You’ll find the complete state-by-state list of contact numbers for …

Welcome to the Costco Customer Service page. Explore our many helpful self-service options and learn more about popular topics.

Some membership changes that require a transaction cannot be made on Costco.com or by Live Chat - see below for information on how to make your requested changes. How do I check warehouse inventory? To use our customer service page instead, follow these steps: Select Chat Us in the lower right corner of the page

Electronics: Costco will accept returns within 90 days (from the date the member received the merchandise) for Televisions, Projectors, Major Appliances (refrigerators above 10 cu. ft., freezers, ranges, cooktops, over-the-range and under-counter microwaves, range hoods, dishwashers, water heaters, washers and dryers), Computers, Touchscreen ...