- Garage Building & Repair, Trumbull - Carports - Garage Builders
- Garage, Door & Window Products, Trumbull
- Garbage & Rubbish Removal, Trumbull
- Garment & Linen Services, Trumbull
- Gas Appliance Repair, Maintenance & Service, Trumbull
- Gas Equipment & Supplies, Trumbull
- Gas Station, Trumbull - Service & Filling Station
- Gasoline, Trumbull
- General Business Consulting, Trumbull
- General Business Services, Trumbull
- General Consultants, Trumbull
- General Freight Trucking, Trumbull - Motor Freight
- General Hardware Stores, Trumbull
- General Management Consulting Services, Trumbull - Management Consultants
- General Merchandise Stores, Trumbull
- General Surgeons, Trumbull - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Trumbull
- Generator Sales & Rental, Trumbull - Contractors Supplies & Equipment
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- Generators, Compressors, Pumps, Motors & Fans, Trumbull
- Gift Baskets, Trumbull
- Gift Shops, Trumbull - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Trumbull
- Gifts, Cards & Stationery Stores, Trumbull
- Glass & Glass Products, Trumbull
- Glass - Auto, Float, Plate, Window & Doors, Trumbull
- Glass Plate Windows, Trumbull
- Golf Courses, Trumbull
- Government, Trumbull
- Graphic Design Services, Trumbull - Graphic Designer
- Graphic Designer & Artist Services, Trumbull
- Greeting Card Stores, Trumbull
- Grocery Stores & Supermarkets, Trumbull
- Ground Transportation, Except Passenger, Trumbull
- Group Homes, Trumbull
- Gym Equipment & Supplies, Trumbull
- Gymnastics Schools, Trumbull
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