As of Sep 2, 2018, Costco operated 762 warehouses including 527 in 44 states, Washington D.C. and Puerto Rico, 100 in Canada, 39 in Mexico, 28 in the UK, 26 in Japan, 15 in South Korea, 13 in Taiwan, 10 in Australia, 2 in Spain, and 1 each in France and Ireland.

In fiscal 2018, the company opened 25 net new warehouses and closed 4 existing warehouses. The company plans on opening at least 20 net new warehouses in fiscal 2019.

At year-end, Costco owned the land and/or the building at 605 store locations, owned the building on leased land at 106 locations and leased 51 store locations. Overall, warehouse clubs averaged 145,000 square feet, with stores in the US averaging 147,000 square feet, stores in Canada averaging 139,000 square feet and other international locations averaging 143,000 square feet.

Store growth2.8%2.8%3.6%4.2%3.5%4.6%
Total gross square feet (M)110,700110,700107,300103,20098,70095,300
Total gross square feet growth3.2%3.2%4.0%4.6%3.6%5.0%
Avg store gross sq ft145,300145,300144,800144,300143,900143,700
Avg store gross sq ft growth0.3%0.3%0.3%0.3%0.1%0.4%