- Games & Hobbies, Oakville
- Garage Doors & Door Operating Devices, Oakville
- Garage Doors & Gates, Oakville - Stores & Companies - Install & Repair Services
- Garage Equipment & Accessories, Oakville
- Garage, Door & Window Products, Oakville
- Garment & Linen Services, Oakville
- Gemologists & Jewelers, Oakville
- General Business Consulting, Oakville
- General Business Services, Oakville
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- General Consultants, Oakville
- General Hardware Stores, Oakville
- Gifts, Cards & Stationery Stores, Oakville
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Oakville
- Government, Oakville
- Grease Traps, Oakville
- Grocery Stores & Supermarkets, Oakville
- Ground Transportation, Except Passenger, Oakville
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