Contact Us

📍 Head Office Address:

999 Lake Drive

Issaquah, Washington 98027, USA 

✉️ Mailing Address:

Costco Wholesale

P.O. Box 34331

Seattle, Washington 98124 

📞 Head Office Phone Number:

(425) 313‑8100 — Available Mon–Fri, 8:00 a.m.–5:00 p.m. PT