EXHIBIT 21.1 COSTCO WHOLESALE CORPORATION SUBSIDIARIES STATE OR OTHER JURISDICTION OF NAME UNDER WHICH INCORPORATION OR SUBSIDIARY DOES SUBSIDIARIES ORGANIZATION BUSINESS - --------------------------------------- --------------------- ------------------------------------- Costco Wholesale Corporation Washington Costco Wholesale Corporation, Costco Wholesale The Price Company California The Price Company, Price Club, Costco Wholesale Costco Wholesale Canada Ltd. Canadian Costco Wholesale Canada, Ltd., Costco Federal Wholesale Costco Canada Inc. Canadian Costco Canada Inc., Federal Price Costco, Costco Price Costco Canada Holdings Inc. Canadian Price Costco Canada Holdings Inc. Federal