- Garage Doors & Door Operating Devices, Martinsville
- Garage Doors & Gates, Martinsville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Martinsville
- Garment & Linen Services, Martinsville
- Gas Station, Martinsville - Service & Filling Station
- General Business Consulting, Martinsville
- General Business Services, Martinsville
- General Consultants, Martinsville
- General Hardware Stores, Martinsville
- General Management Consulting Services, Martinsville - Management Consultants
- General Merchandise Stores, Martinsville
- Generators, Compressors, Pumps, Motors & Fans, Martinsville
- Gifts, Cards & Stationery Stores, Martinsville
- Glass & Fiber Glass Materials, Martinsville - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, Martinsville
- Glass - Auto, Float, Plate, Window & Doors, Martinsville
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- Glass, Plastic & Rubber Working Machinery, Martinsville
- Golf Cars & Carts, Martinsville
- Golf Clubs Private, Martinsville
- Golf Courses, Martinsville
- Golf Equipment & Supplies Stores, Martinsville - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Martinsville
- Gratings Metal, Martinsville
- Grocery Stores & Supermarkets, Martinsville
- Ground Transportation, Except Passenger, Martinsville
- Gun Repair & Services, Martinsville
- Guns & Gunsmith Services, Martinsville
- Gutter & Flashing Contractors, Martinsville - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gutter Covers, Martinsville
- Guttering Contractors, Martinsville - Gutter Cleaning & Repair Services
- Gymnastics Schools, Martinsville
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