List of Costco Stores in Union Gap, WA Outlet Note Regular Brands Costco Washington Union Gap Rating 4.7 based on 76 votes Official Website http://www.costco.com/ Products Handbags Clothing Furniture Jewelry Appliances Electronics Office Products NameAddressPhone Name/Address/Phone Costco outlet - Union Gap 2310 Longfibre Ave (509) 454-5240 People Also Viewed