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Costco

Customer Service Number

1-800-774-2678

Membership and warehouse (US)

TOLL-FREECOMPANY-PUBLISHED NUMBER
United StatesMon–Fri 6am–6pm PT; Sat–Sun 8am–5pm PT
Call CostcoAll contact options
Official sourceChecked 2026-09-20

Toll-free in the listed region. Mobile airtime or international charges may apply.

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Sun Traveller Contact Guide is an independent directory, not Costco’s customer service team. The numbers above belong to the company, not this directory.

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Sun Traveller Contact Guide is independent and is not affiliated with Costco. We cannot access accounts, make reservations or resolve company support cases.