- Games & Hobbies, Martinsburg
- Garage Building & Repair, Martinsburg - Carports - Garage Builders
- Garage Doors & Door Operating Devices, Martinsburg
- Garage Doors & Gates, Martinsburg - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Martinsburg
- Garbage & Rubbish Removal, Martinsburg
- Garment & Linen Services, Martinsburg
- Gas Companies, Martinsburg
- Gas Equipment Industrial, Martinsburg
- Gas Station, Martinsburg - Service & Filling Station
- Gastroenterologists, Martinsburg - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Martinsburg
- General Business Services, Martinsburg
- General Consultants, Martinsburg
- General Freight Trucking, Martinsburg - Motor Freight
- General Management Consulting Services, Martinsburg - Management Consultants
- General Merchandise Stores, Martinsburg
- General Travel Agents & Agencies, Martinsburg
- Generators, Compressors, Pumps, Motors & Fans, Martinsburg
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- Geriatricians, Martinsburg - Geriatric Specialists, Doctors, Physicians & Surgeons
- Gifts, Cards & Stationery Stores, Martinsburg
- Glass & Glass Products, Martinsburg
- Glass & Glazing Contractors, Martinsburg
- Glass - Auto, Float, Plate, Window & Doors, Martinsburg
- Glass Products Manufacturers, Martinsburg
- Glass Tinting & Coating, Martinsburg - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Martinsburg
- Golf Courses, Martinsburg
- Golf Driving Ranges, Martinsburg
- Government, Martinsburg
- Granite, Martinsburg
- Graphic Design Services, Martinsburg - Graphic Designer
- Graphic Designer & Artist Services, Martinsburg
- Grocery Stores & Supermarkets, Martinsburg
- Ground Transportation, Except Passenger, Martinsburg
- Guide & Directory Advertising Services, Martinsburg
- Gun Repair & Services, Martinsburg
- Guns & Gunsmith Services, Martinsburg
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