As of September 3, 2010 (2010 -09-03), Costco has 572 warehouses:
- 416 in the United States and Puerto_Rico
- 79 in Canada
- 32 in Mexico (50-50 joint venture with Comercial_Mexicana)
- 22 in the United Kingdom
- 9 in Japan The latest to open is in Saitama_Prefecture
- 7 in South Korea The latest to open is in Suyeong-gu,_Busan
- 6 in Taiwan
- 1 in Australia
As of November 2005 the world's largest Costco is located in Hillsboro,_Oregon, U.S
