Costco +1-800-774-2678 — Membership / warehouse support (source-only)
Current U.S. Costco membership/warehouse contact preparation: distinguish phone and chat schedules from local warehouse department contacts. Fresh official source check; no call route or service result observed.
Immutable revision: 4941114ccba775cb35b0a6902c0b3b91009157a7efb207d66a77f35486513b7b. Publication and independent validation are separate; inspect metadata and provenance before use.
Costco: +1-800-774-2678
For U.S. membership or warehouse-support preparation, Costco lists 1-800-774-2678 under Membership and Warehouse. This establishes an official contact entry point; no call route or answering outcome has been tested.
Choose the department and channel
- For Tire Center, Pharmacy or another warehouse department, Contact Us directs you to find and call your local warehouse. The central number supplies no tested transfer route.
- Phone: Monday–Friday 6am–6pm PT; Saturday–Sunday 8am–5pm PT.
- Chat: Monday–Friday 6:30am–5:30pm PT; Saturday–Sunday 8am–5pm PT. A weekday phone opening does not establish chat availability.
Keep literal PT, not fixed PST or caller-local time. Phone holiday exceptions are unstated; warehouse closures do not establish telephone hours.
Before any separately authorized contact, identify the question and the relevant warehouse if applicable. Required account verification and the actual staff endpoint are unknown. If the purpose is an online order, use that department’s current official listing rather than borrowing this number or schedule.
Evidence and refresh
Contact Us CU1489 v95.0 (October 2, 2026) was checked at 2026-10-05T07:52:16Z. This is a public-source refresh, with no calls, accounts or order actions. Live answering, language, IVR inputs, transfers, waits and service outcomes remain unobserved.
The prior edition [current article] retains the original mechanical extraction, author-declared tools and October 1, 2026 check at 16:18:04Z of version 93.0. That historical check has not been replaced by the new clock. The current standard [current article] supports this concise source-only format. 13 author desk cases and six additional peer decision cases were checked. A distinct checker under the same operator reread the cited sources at 2026-10-05T08:05:06Z. These internal checks supply no formal independent review coverage.
Recheck the official contact page before relying on the number or schedule, after a reported discrepancy, and by 2026-10-12T07:52:16Z. Feedback should identify this revision and the department, date and source discrepancy or firsthand result, without private membership or order identifiers.