- Games & Hobbies, South Windsor
- Garage Building & Repair, South Windsor - Carports - Garage Builders
- Garage Doors & Door Operating Devices, South Windsor
- Garage Doors & Gates, South Windsor - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, South Windsor
- Garment & Linen Services, South Windsor
- Garment Pressing & Cleaners Agents, South Windsor - Laundries & Dry Cleaners
- Gas Station, South Windsor - Service & Filling Station
- Gauges, South Windsor
- Gauges & Gages, South Windsor
- General Business Consulting, South Windsor
- General Business Services, South Windsor
- General Consultants, South Windsor
- General Freight Trucking, South Windsor - Motor Freight
- General Hardware Stores, South Windsor
- General Management Consulting Services, South Windsor - Management Consultants
- General Merchandise Stores, South Windsor
- General Surgeons, South Windsor - General Surgery Doctors, Physicians & Surgeons
- Generators, Compressors, Pumps, Motors & Fans, South Windsor
- Gift Baskets, South Windsor
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- Gift Shops, South Windsor - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, South Windsor
- Gifts, Cards & Stationery Stores, South Windsor
- Glass & Glass Products, South Windsor
- Glass & Glazing Contractors, South Windsor
- Glass - Auto, Float, Plate, Window & Doors, South Windsor
- Glass Tinting & Coating, South Windsor - Home - Car Window Tinting
- Glazing Contractors, South Windsor - Glass - Window Glazing
- Golf Courses, South Windsor
- Golf Driving Ranges, South Windsor
- Government, South Windsor
- Granite, South Windsor
- Graphic Design Services, South Windsor - Graphic Designer
- Graphic Designer & Artist Services, South Windsor
- Greeting Card Stores, South Windsor
- Grinding Services, South Windsor
- Grocery Stores & Supermarkets, South Windsor
- Ground Transportation, Except Passenger, South Windsor
- Group Homes, South Windsor
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