- Games & Hobbies, Londonderry
- Garage Door Repair, Londonderry
- Garage Doors & Door Operating Devices, Londonderry
- Garage Doors & Gates, Londonderry - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Londonderry
- Garbage & Rubbish Removal, Londonderry
- Garment & Linen Services, Londonderry
- Garments Printing & Lettering, Londonderry
- Gas Station, Londonderry - Service & Filling Station
- General Business Consulting, Londonderry
- General Business Services, Londonderry
- General Consultants, Londonderry
- General Freight Trucking, Londonderry - Motor Freight
- General Hardware Stores, Londonderry
- General Management Consulting Services, Londonderry - Management Consultants
- General Merchandise Stores, Londonderry
- Generators, Compressors, Pumps, Motors & Fans, Londonderry
- Gift Baskets, Londonderry
- Gift Shops, Londonderry - Gift, Novelty & Souvenir Stores
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- Gifts By Type & Occasion, Londonderry
- Gifts, Cards & Stationery Stores, Londonderry
- Glass & Fiber Glass Materials, Londonderry - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, Londonderry
- Glass - Auto, Float, Plate, Window & Doors, Londonderry
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Londonderry
- Golf Courses, Londonderry
- Golf Driving Ranges, Londonderry
- Gourmet Food Stores, Londonderry
- Government, Londonderry
- Granite, Londonderry
- Graphic Design Services, Londonderry - Graphic Designer
- Graphic Designer & Artist Services, Londonderry
- Greeting Card Stores, Londonderry
- Grocery Stores & Supermarkets, Londonderry
- Ground Transportation, Except Passenger, Londonderry
- Gun Repair & Services, Londonderry
- Guns & Gunsmith Services, Londonderry
- Gymnastics Schools, Londonderry
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