- Games & Hobbies, Portsmouth
- Garage Door Repair, Portsmouth
- Garage Doors & Gates, Portsmouth - Stores & Companies - Install & Repair Services
- Garage Organizers, Portsmouth - Garage Storage Companies
- Garage, Door & Window Products, Portsmouth
- Garbage & Rubbish Removal, Portsmouth
- Garbage & Rubbish Removal Equipment & Supplies, Portsmouth
- Garden & Lawn Sprinkler Repair, Installation & Service, Portsmouth
- Garment & Linen Services, Portsmouth
- Gas Appliance Repair, Maintenance & Service, Portsmouth
- Gas Equipment Industrial, Portsmouth
- Gas Piping Contractors, Portsmouth - Gas Pipe Installation & Repair Service
- Gas Station, Portsmouth - Service & Filling Station
- Gears, Portsmouth
- Gears & Gear Cutting, Portsmouth
- General Business Consulting, Portsmouth
- General Business Services, Portsmouth
- General Consultants, Portsmouth
- General Electric Appliances, Portsmouth
- General Freight Trucking, Portsmouth - Motor Freight
- General Hardware Stores, Portsmouth
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- General Management Consulting Services, Portsmouth - Management Consultants
- General Merchandise Stores, Portsmouth
- General Surgeons, Portsmouth - General Surgery Doctors, Physicians & Surgeons
- Generators, Compressors, Pumps, Motors & Fans, Portsmouth
- Geriatric Care Management, Portsmouth
- Gift Shops, Portsmouth - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Portsmouth
- Glass & Glass Products, Portsmouth
- Glass & Glazing Contractors, Portsmouth
- Glass - Auto, Float, Plate, Window & Doors, Portsmouth
- Glass Tinting & Coating, Portsmouth - Home - Car Window Tinting
- Gospel Church, Portsmouth
- Gourmet Restaurants, Portsmouth
- Government, Portsmouth
- Government Information & Offices Miscellaneous, Portsmouth
- Granite, Portsmouth
- Graphic Design Services, Portsmouth - Graphic Designer
- Graphic Designer & Artist Services, Portsmouth
- Grocery Stores & Supermarkets, Portsmouth
- Ground Transportation, Except Passenger, Portsmouth
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