- Gambling Abuse & Addiction - Intervention & Treatment, Portsmouth
- Games & Hobbies, Portsmouth
- Garage Door Repair, Portsmouth
- Garage Doors & Door Operating Devices, Portsmouth
- Garage Doors & Gates, Portsmouth - Stores & Companies - Install & Repair Services
- Garage Doors & Openers Contractors, Portsmouth
- Garage, Door & Window Products, Portsmouth
- Garbage & Rubbish Removal, Portsmouth
- Garment & Linen Services, Portsmouth
- Gas Companies, Portsmouth
- Gas Equipment Industrial, Portsmouth
- Gas Piping Contractors, Portsmouth - Gas Pipe Installation & Repair Service
- Gas Station, Portsmouth - Service & Filling Station
- Gasoline, Portsmouth
- Gastroenterologists, Portsmouth - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Portsmouth
- General Business Consulting, Portsmouth
- General Business Services, Portsmouth
- General Consultants, Portsmouth
- General Freight Trucking, Portsmouth - Motor Freight
- General Hardware Stores, Portsmouth
- General Management Consulting Services, Portsmouth - Management Consultants
- General Merchandise Stores, Portsmouth
- General Travel Agents & Agencies, Portsmouth
- Generators, Compressors, Pumps, Motors & Fans, Portsmouth
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- Geriatric Care Management, Portsmouth
- Gift Baskets, Portsmouth
- Gift Shops, Portsmouth - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Portsmouth
- Gifts, Cards & Stationery Stores, Portsmouth
- Glass & Glass Products, Portsmouth
- Glass - Auto, Float, Plate, Window & Doors, Portsmouth
- Glass Products Manufacturers, Portsmouth
- Glass, Plastic & Rubber Working Machinery, Portsmouth
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Portsmouth
- Golf Courses, Portsmouth
- Golf Lessons & Instruction, Portsmouth
- Gourmet Food Stores, Portsmouth
- Government, Portsmouth
- Government Associations, Portsmouth
- Granite, Portsmouth
- Graphic Design Services, Portsmouth - Graphic Designer
- Graphic Designer & Artist Services, Portsmouth
- Greek Churches, Portsmouth
- Greeting Card Stores, Portsmouth
- Grocery Stores & Supermarkets, Portsmouth
- Ground Spices Manufacturers, Portsmouth
- Ground Transportation, Except Passenger, Portsmouth
- Guide & Directory Advertising Services, Portsmouth
- Gymnastics Schools, Portsmouth
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