- Garage, Door & Window Products, Middlefield
- Garbage & Rubbish Removal, Middlefield
- Garment & Linen Services, Middlefield
- Gas & Air Compressors, Middlefield
- Gas Companies, Middlefield
- Gas Engine, Middlefield
- Gas Equipment Industrial, Middlefield
- Gas Station, Middlefield - Service & Filling Station
- General Business Consulting, Middlefield
- General Business Services, Middlefield
- General Consultants, Middlefield
- General Hardware Stores, Middlefield
- General Merchandise Stores, Middlefield
- Generators, Compressors, Pumps, Motors & Fans, Middlefield
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- Gift Shops, Middlefield - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Middlefield
- Glass & Glass Products, Middlefield
- Glass Stained & Leaded, Middlefield
- Glass, Plastic & Rubber Working Machinery, Middlefield
- Government, Middlefield
- Graphic Design Services, Middlefield - Graphic Designer
- Graphic Designer & Artist Services, Middlefield
- Grocery Stores & Supermarkets, Middlefield
- Ground Transportation, Except Passenger, Middlefield
- Gun Repair & Services, Middlefield
- Guns & Gunsmith Services, Middlefield
- Gutters & Downspout Cleaning & Repairing, Middlefield
- Gymnastics Schools, Middlefield
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