List of Costco Stores in Thornton, CO Outlet Note Regular Brands Costco Colorado Thornton 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 - Thornton 16375 Washington St (303) 474-3245 People Also Viewed