- Garage Doors & Door Operating Devices, Mattawan
- Garage Doors & Gates, Mattawan - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Mattawan
- Garment & Linen Services, Mattawan
- Gas Appliance Repair, Maintenance & Service, Mattawan
- Gas Piping Contractors, Mattawan - Gas Pipe Installation & Repair Service
- Gas Station, Mattawan - Service & Filling Station
- General Business Services, Mattawan
- General Merchandise Stores, Mattawan
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- Glass Making & Working Machinery, Mattawan
- Glass Products Manufacturers, Mattawan
- Glass, Plastic & Rubber Working Machinery, Mattawan
- Government, Mattawan
- Grocery Stores & Supermarkets, Mattawan
- Ground Transportation, Except Passenger, Mattawan
- Gun & Hunting & Fishing Clubs, Mattawan
- Gun Repair & Services, Mattawan
- Guns & Gunsmith Services, Mattawan
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