- Garage, Door & Window Products, Clarksville
- Garbage & Rubbish Removal, Clarksville
- Garment & Linen Services, Clarksville
- Gas Companies, Clarksville
- Gas Line Installation Contractors, Clarksville - Gas Pipe Installation - Repair Service
- Gas Station, Clarksville - Service & Filling Station
- Gasoline, Clarksville
- Genealogy, Clarksville
- General Business Services, Clarksville
- General Freight Trucking, Clarksville - Motor Freight
- General Merchandise Stores, Clarksville
- General Surgeons, Clarksville - General Surgery Doctors, Physicians & Surgeons
- Gift Shops, Clarksville - Gift, Novelty & Souvenir Stores
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- Gifts By Type & Occasion, Clarksville
- Gifts, Cards & Stationery Stores, Clarksville
- Glass & Glass Products, Clarksville
- Glass & Glazing Contractors, Clarksville
- Glass - Auto, Float, Plate, Window & Doors, Clarksville
- Glass Tinting & Coating, Clarksville - Home - Car Window Tinting
- Golf Clubs Private, Clarksville
- Golf Equipment & Supplies Stores, Clarksville - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Clarksville
- Grocery Stores & Supermarkets, Clarksville
- Ground Transportation, Except Passenger, Clarksville
- Gun Repair & Services, Clarksville
- Guns & Gunsmith Services, Clarksville
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