- Garage Building & Repair, Southbury - Carports - Garage Builders
- Garage, Door & Window Products, Southbury
- Garbage & Rubbish Removal, Southbury
- Garment & Linen Services, Southbury
- Gas Station, Southbury - Service & Filling Station
- Gastroenterologists, Southbury - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gauges, Southbury
- Gauges & Gages, Southbury
- General Business Consulting, Southbury
- General Business Services, Southbury
- General Consultants, Southbury
- General Freight Trucking, Southbury - Motor Freight
- General Hardware Stores, Southbury
- General Merchandise Stores, Southbury
- General Travel Agents & Agencies, Southbury
- Generators, Compressors, Pumps, Motors & Fans, Southbury
- Gift Baskets, Southbury
- Gift Shops, Southbury - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Southbury
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- Gifts, Cards & Stationery Stores, Southbury
- Glass & Glass Products, Southbury
- Glass - Auto, Float, Plate, Window & Doors, Southbury
- Glass Plate Windows, Southbury
- Golf Clubs Private, Southbury
- Golf Courses, Southbury
- Golf Courses - Resorts, Southbury
- Gourmet Restaurants, Southbury
- Government, Southbury
- Graphic Design Services, Southbury - Graphic Designer
- Graphic Designer & Artist Services, Southbury
- Grease Traps, Southbury
- Greeting Card Stores, Southbury
- Grocery Stores & Supermarkets, Southbury
- Ground Transportation, Except Passenger, Southbury
- Gun Repair & Services, Southbury
- Guns & Gunsmith Services, Southbury
- Gutters & Downspout Cleaning & Repairing, Southbury
- Gymnastics Schools, Southbury
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