Costco
Customer Service Number
Costcocostco.com
TOLL-FREECOMPANY-PUBLISHED NUMBER
Membership and warehouse (US)
1-800-774-2678United StatesMon–Fri 6am–6pm PT; Sat–Sun 8am–5pm PT
Official sourceChecked 2026-09-20
Toll-free in the listed region. Mobile airtime or international charges may apply.
Thistle Crossing 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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Contact channels for Costco
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Online orders and Costco Logistics deliveries (US)
Source · Checked 2026-09-20Official website
Source · Checked 2026-09-10Thistle Crossing Contact Guide is independent and is not affiliated with Costco. We cannot access accounts, make reservations or resolve company support cases.