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Monday to Friday, 5am to 10pm PT
Saturday to Sunday, 6am to 6pm PT
- Return or Cancel your Costco.com order through our website.
- Lower price for an item on your order? Use our Price Adjustment Form.
- Update your Costco.com account info.
- Access/Update your Costco Membership.
- Share your Feedback.
Give Us a Call
Hours vary by department.
Corporate Mailing Address
PO Box 34331
Seattle, WA 98124