- Gambling Abuse & Addiction - Intervention & Treatment, Groton
- Games & Hobbies, Groton
- Garage Building & Repair, Groton - Carports - Garage Builders
- Garage, Door & Window Products, Groton
- Garment & Linen Services, Groton
- Gas Detection, Asbestos & Lead Contractors, Groton
- Gas Equipment Industrial, Groton
- Gas Liquefied Petroleum, Groton
- Gas Station, Groton - Service & Filling Station
- Gases, Groton
- General Business Consulting, Groton
- General Business Services, Groton
- General Consultants, Groton
- General Freight Trucking, Groton - Motor Freight
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- General Hardware Stores, Groton
- General Merchandise Stores, Groton
- General Surgeons, Groton - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Groton
- Gift Shops, Groton - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Groton
- Glass & Glass Products, Groton
- Glass - Auto, Float, Plate, Window & Doors, Groton
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Groton
- Golf Courses, Groton
- Government, Groton
- Grocery Stores & Supermarkets, Groton
- Ground Transportation, Except Passenger, Groton
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