- Garage, Door & Window Products, Skowhegan
- Garment & Linen Services, Skowhegan
- Gas Line Installation Contractors, Skowhegan - Gas Pipe Installation - Repair Service
- Gastroenterologists, Skowhegan - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Services, Skowhegan
- General Freight Trucking, Skowhegan - Motor Freight
- General Hardware Stores, Skowhegan
- General Merchandise Stores, Skowhegan
- Gifts, Cards & Stationery Stores, Skowhegan
- Glass & Glass Products, Skowhegan
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- Glass - Auto, Float, Plate, Window & Doors, Skowhegan
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Skowhegan
- Golf Courses, Skowhegan
- Government, Skowhegan
- Grocery Stores & Supermarkets, Skowhegan
- Ground Transportation, Except Passenger, Skowhegan
- Gun Repair & Services, Skowhegan
- Guns & Gunsmith Services, Skowhegan
- Gymnastics Schools, Skowhegan
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