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Costco Customer Service Number

Costcocostco.com
TOLL-FREECOMPANY-PUBLISHED NUMBER

Membership and warehouse support (US)

1-800-774-2678
United StatesMon–Fri 6am–6pm PT; Sat–Sun 8am–5pm PT
Call CostcoAll contact options
Official sourceChecked 2026-09-10

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

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