- Games & Hobbies, Portsmouth
- Garage Building & Repair, Portsmouth - Carports - Garage Builders
- Garage, Door & Window Products, Portsmouth
- Garbage & Rubbish Removal, Portsmouth
- Garment & Linen Services, Portsmouth
- Gas Equipment Industrial, Portsmouth
- Gas Station, Portsmouth - Service & Filling Station
- Gastroenterologists, Portsmouth - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Portsmouth
- General Business Services, Portsmouth
- General Consultants, Portsmouth
- General Freight Trucking, Portsmouth - Motor Freight
- General Hardware Stores, Portsmouth
- General Merchandise Stores, Portsmouth
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- General Surgeons, Portsmouth - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Portsmouth
- Gifts, Cards & Stationery Stores, Portsmouth
- Glass & Glass Products, Portsmouth
- Glass - Auto, Float, Plate, Window & Doors, Portsmouth
- Glass Plate Windows, Portsmouth
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Portsmouth
- Government, Portsmouth
- Government And Administration Attorneys & Lawyers, Portsmouth
- Government And Administration Attorneys & Lawyers, Portsmouth
- Government And Administration Lawyers & Attorneys, Portsmouth
- Gray & Ductile Iron Foundries, Portsmouth
- Grocery Stores & Supermarkets, Portsmouth
- Ground Transportation, Except Passenger, Portsmouth
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