- Games & Hobbies, Gloucester
- Garage, Door & Window Products, Gloucester
- Garbage & Rubbish Removal, Gloucester
- Garment & Linen Services, Gloucester
- Garment Pressing & Cleaners Agents, Gloucester - Laundries & Dry Cleaners
- Gas Companies, Gloucester
- Gas Equipment & Supplies, Gloucester
- Gas Equipment Industrial, Gloucester
- Gas Piping Contractors, Gloucester - Gas Pipe Installation & Repair Service
- Gas Station, Gloucester - Service & Filling Station
- General Business Consulting, Gloucester
- General Business Services, Gloucester
- General Consultants, Gloucester
- General Freight Trucking, Gloucester - Motor Freight
- General Hardware Stores, Gloucester
- General Management Consulting Services, Gloucester - Management Consultants
- General Merchandise Stores, Gloucester
- General Travel Agents & Agencies, Gloucester
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- Geophysical Research, Gloucester
- Gifts, Cards & Stationery Stores, Gloucester
- Glass & Glass Products, Gloucester
- Glass - Auto, Float, Plate, Window & Doors, Gloucester
- Glass Stained & Leaded, Gloucester
- Glass, Plastic & Rubber Working Machinery, Gloucester
- Golf Clubs Private, Gloucester
- Golf Courses, Gloucester
- Golf Equipment & Supplies Stores, Gloucester - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Food Stores, Gloucester
- Government, Gloucester
- Graphic Design Services, Gloucester - Graphic Designer
- Graphic Designer & Artist Services, Gloucester
- Grills & Grilling Equipment & Supplies, Gloucester
- Grocery Stores & Supermarkets, Gloucester
- Ground Transportation, Except Passenger, Gloucester
- Gymnastics Schools, Gloucester
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