, the three largest warehouse club chains operating in the United States are BJs, Costco, and Sam's Club. BJ's Wholesale Club is one of the smaller competitors, with stores located primarily in the Eastern United States. Costco and Sam's Club are the largest chains. Costco has locations in seven other nations including Australia, Canada, Japan, Korea, Mexico, Taiwan, and the United Kingdom. Sam's Club, a division of Walmart, claims a membership base of 47 million persons and 602 stores across the United States (as of June 2019).