- Games & Hobbies, Dundas
- Garage Doors & Door Operating Devices, Dundas
- Garage Doors & Gates, Dundas - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Dundas
- Garment & Linen Services, Dundas
- Gas Companies, Dundas
- Gas Station, Dundas - Service & Filling Station
- Gazebo Builders, Dundas - Installation, Repair & Maintenance Services
- General Business Consulting, Dundas
- General Business Services, Dundas
- General Consultants, Dundas
- General Management Consulting Services, Dundas - Management Consultants
- General Merchandise Stores, Dundas
- General Travel Agents & Agencies, Dundas
- Generators, Compressors, Pumps, Motors & Fans, Dundas
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- Gifts, Cards & Stationery Stores, Dundas
- Glass & Glass Products, Dundas
- Glass - Auto, Float, Plate, Window & Doors, Dundas
- Glass - Beveled, Carved, Etched & Ornamental, Dundas
- Golf Clubs Private, Dundas
- Golf Courses, Dundas
- Goodyear Tires, Dundas - Dealers
- Gourmet Food Stores, Dundas
- Government, Dundas
- Graphic Designer & Artist Services, Dundas
- Grease & Oil Disposal Sites, Dundas
- Grills & Grilling Equipment & Supplies, Dundas
- Grocery Stores & Supermarkets, Dundas
- Ground Transportation, Except Passenger, Dundas
- Grouting Contractors, Dundas
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