- Games & Hobbies, Montmagny
- Garage, Door & Window Products, Montmagny
- Garment & Linen Services, Montmagny
- Gas Station, Montmagny - Service & Filling Station
- General Business Consulting, Montmagny
- General Business Services, Montmagny
- General Consultants, Montmagny
- General Hardware Stores, Montmagny
- General Merchandise Stores, Montmagny
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- Generators, Compressors, Pumps, Motors & Fans, Montmagny
- Gifts, Cards & Stationery Stores, Montmagny
- Glass & Glazing Contractors, Montmagny
- Glazing Contractors, Montmagny - Glass - Window Glazing
- Golf Clubs Private, Montmagny
- Golf Courses, Montmagny
- Government, Montmagny
- Ground Transportation, Except Passenger, Montmagny
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