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  • Contact Us

    Contact Us

    We at Costco welcome your feedback. Here's how you can contact us:

    Costco Member Questions: Member Questions & Comments

    Web address: http://www.costco.com

    Costco's corporate mailing address is:
    PO Box 34331
    Seattle, WA 98124

    Costco's corporate offices are located at:
    999 Lake Drive
    Issaquah, WA 98027

    Costco.com Member Service: 1-800-955-2292

    Costco.com Pharmacy: 1-800-607-6861

    General Member Service: 1-800-774-2678

    Business Delivery Member Service: 1-800-788-9968

    Costco Travel: 1-877-849-2730