List of Costco Stores in Seattle, WA Outlet Note Regular Brands Costco Washington Seattle 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 - Seattle 4401 4th Ave S (206) 674-1220 People Also Viewed