- Garbage & Rubbish Removal, Jamestown
- Garment & Linen Services, Jamestown
- Gas Companies, Jamestown
- Gas Equipment Industrial, Jamestown
- General Business Services, Jamestown
- General Hardware Stores, Jamestown
- General Merchandise Stores, Jamestown
- Gifts, Cards & Stationery Stores, Jamestown
- Glass & Glass Products, Jamestown
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- Glass & Glazing Contractors, Jamestown
- Glass Plate Windows, Jamestown
- Glazing Contractors, Jamestown - Glass - Window Glazing
- Go Kart Tracks, Jamestown
- Golf Clubs Private, Jamestown
- Golf Courses, Jamestown
- Government, Jamestown
- Grocery Stores & Supermarkets, Jamestown
- Ground Transportation, Except Passenger, Jamestown
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