- Games & Hobbies, Portsmouth
- Garage Doors & Door Operating Devices, Portsmouth
- Garage Doors & Gates, Portsmouth - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Portsmouth
- Garment & Linen Services, Portsmouth
- Gastroenterologists, Portsmouth - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Portsmouth
- General Business Services, Portsmouth
- General Consultants, Portsmouth
- General Hardware Stores, Portsmouth
- General Travel Agents & Agencies, Portsmouth
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- Generators, Portsmouth - Solar, Steam, Wind Power, etc
- Gifts, Cards & Stationery Stores, Portsmouth
- Glass & Glass Products, Portsmouth
- Glass Stained & Leaded, Portsmouth
- Golf Courses, Portsmouth
- Government, Portsmouth
- Graphic Designer & Artist Services, Portsmouth
- Grocery Stores & Supermarkets, Portsmouth
- Ground Transportation, Except Passenger, Portsmouth
- Gun Repair & Services, Portsmouth
- Guns & Gunsmith Services, Portsmouth
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