- Garage Building & Repair, Watertown - Carports - Garage Builders
- Garage Doors & Door Operating Devices, Watertown
- Garage Doors & Gates, Watertown - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Watertown
- Garment & Linen Services, Watertown
- Gas Companies, Watertown
- Gas Liquefied Petroleum, Watertown
- Gas Station, Watertown - Service & Filling Station
- Gases, Watertown
- Gemologists & Jewelers, Watertown
- General Business Consulting, Watertown
- General Business Services, Watertown
- General Consultants, Watertown
- General Freight Trucking, Watertown - Motor Freight
- General Hardware Stores, Watertown
- General Merchandise Stores, Watertown
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- General Surgeons, Watertown - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Watertown
- Generators, Compressors, Pumps, Motors & Fans, Watertown
- Gift Shops, Watertown - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Watertown
- Glass & Glass Products, Watertown
- Glass - Auto, Float, Plate, Window & Doors, Watertown
- Glass Products Manufacturers, Watertown
- Golf Equipment & Supplies Stores, Watertown - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Restaurants, Watertown
- Government, Watertown
- Granite, Watertown
- Greeting Card Stores, Watertown
- Grocery Stores & Supermarkets, Watertown
- Ground Transportation, Except Passenger, Watertown
- Gymnastics Schools, Watertown
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