List of Costco Stores in Mount Prospect, IL Outlet Note Regular Brands Costco Illinois Mount Prospect 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 - Mount Prospect 999 N Elmhurst Rd (847) 660-2000 People Also Viewed