- Garage, Door & Window Products, Thomaston
- Garment & Linen Services, Thomaston
- Gas Station, Thomaston - Service & Filling Station
- General Business Consulting, Thomaston
- General Business Services, Thomaston
- General Consultants, Thomaston
- General Hardware Stores, Thomaston
- General Merchandise Stores, Thomaston
- Generators, Compressors, Pumps, Motors & Fans, Thomaston
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- Glass & Glass Products, Thomaston
- Glass - Auto, Float, Plate, Window & Doors, Thomaston
- Government, Thomaston
- Granite, Thomaston
- Graphic Design Services, Thomaston - Graphic Designer
- Graphic Designer & Artist Services, Thomaston
- Grocery Stores & Supermarkets, Thomaston
- Ground Transportation, Except Passenger, Thomaston
- Gun & Hunting & Fishing Clubs, Thomaston
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