Where can I use my Costco membership? Your membership is good at more than 606 Costco locations worldwide. For a complete list of locations, visit [www.costco.com]  Why do I have to show my membership card upon entrance to the warehouse? Since our members pay a fee to shop at Costco, we allow only Costco members to shop. Your picture appears on the card because your membership card can be used only by you and is non-transferable. Your picture also prevents unauthorized use should your card ever be lost and stolen.  What are Costco’s hours of operation?   General hours for all 8 warehouses are: Monday through Sunday, 10 a.m. to 9:30 p.m.  Why am I asked to show my receipts as I exit the warehouse?   Staffing the doors is our most effective method of maintaining accuracy in inventory control. It benefits both us Costco and our members. This practice ensures that you received everything you paid for and were not overcharged or undercharged for any item.  What types of payment does Costco accept?   You may pay by cash, China Trust co-branded credit card and American Express. We do not accept other credit cards because their fees would increase the costs to us and our members. Members must use their own China Trust co-branded credit card or the American Express card for payment.  May I bring in a friend who’s not a member?   Yes. You may bring up to two guests into the warehouse each time you shop, though only Costco members may purchase items.  Why are there no express lines?   he answer is two-fold. First, the majority of our members typically purchase a large quantity of products during their shopping visits to our warehouses. Currently, the typical member purchases an average of 14 Items each and every time he or she shops. Secondly, operating an express checkout line adds additional overhead costs, thereby driving up our cost of doing business.  Why are there no dressing rooms?   We are trying to adhere to a no-frills policy. This means keeping our costs as low as possible. Dressing rooms take employees to staff them as well as floor space that could be better utilized. But, remember our return policy: if something doesn’t fit, just bring it back for a full refund.  How do I return merchandise?   Bring your merchandise and receipt directly to our membership desk for a full and courteous refund. It is helpful (but not required) if you bring the original packaging and literature as well.