Costco Headquarters and Corporate Offices. See the Costco Corporate office contact details here. Learn how to contact the Costco Headquarters by mail, phone and email and see the full executive team. Costco Wholesale is an American warehouse bulk retailer. It is the largest membership-only warehouse club in the United States, and also the second largest retailer in the world, with 706 wordwide outlets. Costco Headquarters. The Costco company has 2 different mail addresses for their corporate office. The Seattle address is meant for customer queries, whereas the Issaquah address is used for corporate correspondence. Costco Corporate Office Addresses. Costco Headquarters P.O. Box 34331 Seattle, WA 98124 Or Costco Headquarters 999 Lake Dr. Issaquah, WA 98027 Costco Headquarters Phone Number: The Costco Corporate Office phone number is: 1-425-313-8100. The members only customer service phone number is: 1-800-774-2678 Costco Headquarters Email. We have found no corporate email address for Costco, but you can use their customer care email form, to direct emails to the company. Costco also has a dedicated customer service email address, which is: firstname.lastname@example.org Costco Headquarters Website: The closest, that Costco has to a corporate website is their Investors Relations page, which lists their Investors Relations contact information and email address at email@example.com. It also lists the pgone and fax numbers of their Executive Vice President and Chief Financial Officer. The Costco Headquarters at Lake Dr. Issaquah, Washington. The Costco Executive Team. These key leaders are all members of the Costco executive team. W. Craig Jelinek - President and CEO Richard A. Galanti - Chief Financial Officer Joseph P. Portera - Exec VP/COO:Eastern & Canadian Dennis R. Zook - Exec VP/COO:Southwest & Mexico Jeffrey H. Brotman Pat Callans Roger A. Campbell Richard C. Chavez John B. Gaherty Jaime Gonzalez Bruce A. Greenwood Ginnie M. Roeglin Timothy L. Rose Yoram Rubanenko Doug W. Schutt John Thelan Robert D. Hicok Dennis A. Hoover Dennis Knapp Franz Lazarus Jeffrey Long Jeffrey Lyons John McKay Russ Miller Ali Moayeri Paul G. Moulton James P. Murphy Rich Olin David S. Petterson Pierre Riel Ron Vachris Costco Brands and Trademarks. These are some of Costco trademarked brand names: Kirkland Signature is Costco's private label. Costco Auto. Costco travel. Costco Resources. \tCostco Website \tCostco on Twitter \tCostco on Facebook \tContact Page \tContact Form \tInvestors Relations Please share your Costco complaints, issues or experiences in the comment section.