As of May 7, 2017, Costco operated 729 warehouses including 508 in 44 states, Washington D.C. and Puerto Rico, 95 in Canada, 37 in Mexico, 28 in the UK, 25 in Japan, 13 in South Korea, 13 in Taiwan, 8 in Australia and 2 in Spain.

In fiscal 2016, the company opened 33 new warehouses and closed 4 existing warehouses. The company opened 14 net new warehouses during the first nine months of fiscal 2017, and plan to open up to 12 new warehouses for the remainder of fiscal 2017.

At year-end, Costco owned the land and/or the building at 568 store locations, owned the building on leased land at 98 locations and leased 49 store locations. Overall, warehouse clubs averaged 144,000 square feet, with stores in the US averaging 146,000 square feet, stores in Canada averaging 138,000 square feet and other international locations averaging 141,000 square feet.

Store growth3.4%4.2%3.5%4.6%4.3%2.7%
Total gross square feet (M)105,333103,20098,70095,30090,80586,937
Total gross square feet growth3.7%4.6%3.6%5.0%4.4%3.0%
Avg store gross sq ft144,500144,300143,900143,700143,200143,000
Avg store gross sq ft growth0.2%0.3%0.1%0.4%0.2%0.3%