- Games & Hobbies, Williamston
- Garage Doors & Gates, Williamston - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Williamston
- Garment & Linen Services, Williamston
- Gas Station, Williamston - Service & Filling Station
- General Business Services, Williamston
- General Merchandise Stores, Williamston
- Gift Shops, Williamston - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Williamston
- Glass & Glass Products, Williamston
- Glass - Auto, Float, Plate, Window & Doors, Williamston
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- Glass Plate Windows, Williamston
- Glass Products Manufacturers, Williamston
- Glass, Plastic & Rubber Working Machinery, Williamston
- Golf Courses, Williamston
- Government, Williamston
- Grain Elevators, Williamston
- Greenhouse Supplies, Kits & Equipment, Williamston
- Grocery Stores & Supermarkets, Williamston
- Ground Transportation, Except Passenger, Williamston
- Gun Repair & Services, Williamston
- Guns & Gunsmith Services, Williamston
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