Costco Corporate Office Address. Costco Wholesale Corporation. Lake Dr. Issaquah, WA9. Contact Costco. Phone Number 4. Fax Number 4. 25 3. Website http www. Email Email Costco. Executives. CEO W. Craig Jelinek. CFO Richard A. Galanti. COO Joseph P. Portera. Costco History. Costco was founded in 1. James Jim Sinegal and Jeffrey Brotman. Their first store was located in Seattle, Washington. In 1. 99. 3, Costco merged with Price Club, effectively doubling the size of the company. The executives from both companies never saw eye to eye and they split in 1. In 1. 99. 7, the company name was changed to Costco Wholesale. Costco is currently the fifth largest retailer in the US and is also the worlds largest wine retailer. Their major competitors are Sams Club and BJs wholesale. Besides the US, Costco has locations in Canada, Australia, the UK, Mexico, Taiwan, South Korea and Japan. The Costco corporate office is located in Kirkland, WA. Tagged as. costco corporate headquarters.