- Gambling & Lottery Services, Watertown
- Games & Hobbies, Watertown
- Garage Door Repair, Watertown
- Garage Doors & Door Operating Devices, Watertown
- Garage Doors & Gates, Watertown - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Watertown
- Garbage & Rubbish Removal, Watertown
- Garment & Linen Services, Watertown
- Gas Equipment Industrial, Watertown
- Gas Station, Watertown - Service & Filling Station
- Gasoline, Watertown
- General Business Consulting, Watertown
- General Business Services, Watertown
- General Consultants, Watertown
- General Freight Trucking, Watertown - Motor Freight
- General Hardware Stores, Watertown
- General Management Consulting Services, Watertown - Management Consultants
- General Merchandise Stores, Watertown
- General Surgeons, Watertown - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Watertown
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- Generators, Compressors, Pumps, Motors & Fans, Watertown
- Geothermal Heating & Cooling Contractors, Watertown - Geothermal HVAC - Installation
- Gift Shops, Watertown - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Watertown
- Glass & Glass Products, Watertown
- Glass & Glazing Contractors, Watertown
- Glass - Auto, Float, Plate, Window & Doors, Watertown
- Glass Stained & Leaded, Watertown
- Glass Tinting & Coating, Watertown - Home - Car Window Tinting
- Golf Courses, Watertown
- Gourmet Restaurants, Watertown
- Government, Watertown
- Grain Elevators, Watertown
- Grain Handling Equipment, Watertown
- Graphic Design Services, Watertown - Graphic Designer
- Graphic Designer & Artist Services, Watertown
- Grocery Stores & Supermarkets, Watertown
- Ground Transportation, Except Passenger, Watertown
- Gun Repair & Services, Watertown
- Guns & Gunsmith Services, Watertown
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