- Games & Hobbies, Frostburg
- Garbage & Rubbish Removal, Frostburg
- Garment & Linen Services, Frostburg
- Gas Companies, Frostburg
- General Business Services, Frostburg
- General Freight Trucking, Frostburg - Motor Freight
- General Management Consulting Services, Frostburg - Management Consultants
- General Merchandise Stores, Frostburg
- Gift Shops, Frostburg - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Frostburg
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- Glass & Glazing Contractors, Frostburg
- Glass Tinting & Coating, Frostburg - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Frostburg
- Golf Courses, Frostburg
- Government, Frostburg
- Grocery Stores & Supermarkets, Frostburg
- Ground Transportation, Except Passenger, Frostburg
- Gun Repair & Services, Frostburg
- Guns & Gunsmith Services, Frostburg
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