- Games Toys & Childrens Vehicles Manufacturers, Southington
- Garage Building & Repair, Southington - Carports - Garage Builders
- Garage, Door & Window Products, Southington
- Garden & Lawn Sprinkler Repair, Installation & Service, Southington
- Garment & Linen Services, Southington
- Gas Station, Southington - Service & Filling Station
- Gastroenterologists, Southington - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Southington
- General Business Services, Southington
- General Consultants, Southington
- General Freight Trucking, Southington - Motor Freight
- General Hardware Stores, Southington
- General Merchandise Stores, Southington
- General Travel Agents & Agencies, Southington
- Generators, Compressors, Pumps, Motors & Fans, Southington
- Gift Baskets, Southington
- Gift Shops, Southington - Gift, Novelty & Souvenir Stores
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- Gifts By Type & Occasion, Southington
- Gifts, Cards & Stationery Stores, Southington
- Glass & Glass Products, Southington
- Glass - Auto, Float, Plate, Window & Doors, Southington
- Glass Plate Windows, Southington
- Golf Courses, Southington
- Golf Driving Ranges, Southington
- Gourmet Restaurants, Southington
- Government, Southington
- Granite, Southington
- Graphic Designer & Artist Services, Southington
- Greeting Card Stores, Southington
- Grocery Stores & Supermarkets, Southington
- Ground Transportation, Except Passenger, Southington
- Group Homes, Southington
- Gummed Tape, Southington
- Gun & Hunting & Fishing Clubs, Southington
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