- Garage, Door & Window Products, Montville
- Garbage & Rubbish Removal, Montville
- Garment & Linen Services, Montville
- Gas Station, Montville - Service & Filling Station
- Gauges, Montville
- Gauges & Gages, Montville
- General Business Consulting, Montville
- General Business Services, Montville
- General Consultants, Montville
- General Freight Trucking, Montville - Motor Freight
- General Management Consultants & Services, Montville
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- General Management Consulting Services, Montville - Management Consultants
- General Merchandise Stores, Montville
- General Surgeons, Montville - General Surgery Doctors, Physicians & Surgeons
- Glass & Glass Products, Montville
- Glass - Auto, Float, Plate, Window & Doors, Montville
- Glass, Plastic & Rubber Working Machinery, Montville
- Golf Courses, Montville
- Government, Montville
- Grocery Stores & Supermarkets, Montville
- Ground Transportation, Except Passenger, Montville
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