- Games & Hobbies, Thurmont
- Garbage & Rubbish Removal, Thurmont
- Garment & Linen Services, Thurmont
- Gas Station, Thurmont - Service & Filling Station
- General Business Services, Thurmont
- General Freight Trucking, Thurmont - Motor Freight
- General Merchandise Stores, Thurmont
- General Travel Agents & Agencies, Thurmont
- Gifts By Type & Occasion, Thurmont
- Gifts, Cards & Stationery Stores, Thurmont
- Glass & Glass Products, Thurmont
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- Glass - Auto, Float, Plate, Window & Doors, Thurmont
- Golf Courses, Thurmont
- Golf Equipment & Supplies Stores, Thurmont - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Thurmont
- Granite, Thurmont
- Graphic Design Services, Thurmont - Graphic Designer
- Graphic Designer & Artist Services, Thurmont
- Grocery Stores & Supermarkets, Thurmont
- Ground Transportation, Except Passenger, Thurmont
- Gun Repair & Services, Thurmont
- Guns & Gunsmith Services, Thurmont
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