CostCo Сustomer Service

Phone:

1-800-955-2292

Email:

This information has not been added

Fax:

This information has not been added

Mail:

PO Box 34331
Seattle, WA 98124

Additional Contact Information

General Member Service: 1-800-774-2678
Business Delivery Member Service: 1-800-788-9968
Costco Travel: 1-877-849-2730
Costco.com Pharmacy: 1-800-607-6861

Costco’s corporate offices are located at:
999 Lake Drive
Issaquah, WA 98027