List of Costco Stores in Frederick, MD Outlet Note Regular Brands Costco Maryland Frederick 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 - Frederick 10 Monocacy Blvd (301) 644-1483 People Also Viewed