Costco Customer Service Number
Costcocostco.com
TOLL-FREECOMPANY-PUBLISHED NUMBER
Membership and warehouse support (US)
1-800-774-2678United StatesMon–Fri 6am–6pm PT; Sat–Sun 8am–5pm PT
Official sourceChecked 2026-09-10
Toll-free in the listed region. Mobile airtime or international charges may apply.
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Source · Checked 2026-09-10Review Blog Day is independent and is not affiliated with Costco. We cannot access accounts, make reservations or resolve company support cases.