- Games & Hobbies, Topsham
- Garage, Door & Window Products, Topsham
- Garbage & Rubbish Removal, Topsham
- Garment & Linen Services, Topsham
- General Business Consulting, Topsham
- General Business Services, Topsham
- General Consultants, Topsham
- General Merchandise Stores, Topsham
- Gifts, Cards & Stationery Stores, Topsham
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- Glass & Glass Products, Topsham
- Glass - Auto, Float, Plate, Window & Doors, Topsham
- Golf Courses, Topsham
- Government, Topsham
- Granite, Topsham
- Greeting Card Stores, Topsham
- Grocery Stores & Supermarkets, Topsham
- Ground Transportation, Except Passenger, Topsham
- Gymnastics Schools, Topsham
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