- Games & Hobbies, Streetsville
- Garage Door Repair, Streetsville
- Garage Doors & Door Operating Devices, Streetsville
- Garage Doors & Gates, Streetsville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Streetsville
- Garbage & Rubbish Removal, Streetsville
- Garment & Linen Services, Streetsville
- Garment Pressing & Cleaners Agents, Streetsville - Laundries & Dry Cleaners
- Gas Companies, Streetsville
- Gas Station, Streetsville - Service & Filling Station
- Gauges, Streetsville
- Gauges & Gages, Streetsville
- General Business Consulting, Streetsville
- General Business Services, Streetsville
- General Consultants, Streetsville
- General Hardware Stores, Streetsville
- General Management Consulting Services, Streetsville - Management Consultants
- General Merchandise Stores, Streetsville
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- General Travel Agents & Agencies, Streetsville
- Generators, Compressors, Pumps, Motors & Fans, Streetsville
- Gifts By Type & Occasion, Streetsville
- Gifts, Cards & Stationery Stores, Streetsville
- Glass & Glass Products, Streetsville
- Glass - Auto, Float, Plate, Window & Doors, Streetsville
- Golf Courses, Streetsville
- Golf Lessons & Instruction, Streetsville
- Government, Streetsville
- Granite, Streetsville
- Graphic Design Services, Streetsville - Graphic Designer
- Graphic Designer & Artist Services, Streetsville
- Greek Restaurants, Streetsville
- Greeting Card Stores, Streetsville
- Grocery Stores & Supermarkets, Streetsville
- Ground Transportation, Except Passenger, Streetsville
- Gymnastic Clubs, Streetsville
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