- Games & Hobbies, Southampton
- Garage Door Repair, Southampton
- Garage Doors & Door Operating Devices, Southampton
- Garage Doors & Gates, Southampton - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Southampton
- Garbage & Rubbish Removal, Southampton
- Garment & Linen Services, Southampton
- Gas Companies, Southampton
- Gas Station, Southampton - Service & Filling Station
- Gemologists & Jewelers, Southampton
- General Business Consulting, Southampton
- General Business Services, Southampton
- General Consultants, Southampton
- General Hardware Stores, Southampton
- General Management Consulting Services, Southampton - Management Consultants
- General Merchandise Stores, Southampton
- General Travel Agents & Agencies, Southampton
- Generators, Compressors, Pumps, Motors & Fans, Southampton
- Gift Baskets, Southampton
- Gift Shops, Southampton - Gift, Novelty & Souvenir Stores
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- Gifts By Type & Occasion, Southampton
- Gifts Wholesale & Retail, Southampton
- Gifts, Cards & Stationery Stores, Southampton
- Glass & Glass Products, Southampton
- Glass - Beveled, Carved, Etched & Ornamental, Southampton
- Glass Stained & Leaded, Southampton
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Southampton
- Golf Equipment & Supplies Stores, Southampton - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Food Stores, Southampton
- Government, Southampton
- Graphic Design Services, Southampton - Graphic Designer
- Graphic Designer & Artist Services, Southampton
- Greeting Card Stores, Southampton
- Grocery Stores & Supermarkets, Southampton
- Ground Transportation, Except Passenger, Southampton
- Gummed Tape, Southampton
- Gun & Hunting & Fishing Clubs, Southampton
- Gun Repair & Services, Southampton
- Guns & Gunsmith Services, Southampton
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