- Games & Hobbies, Stouffville
- Garage Door Repair, Stouffville
- Garage Doors & Door Operating Devices, Stouffville
- Garage Doors & Gates, Stouffville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Stouffville
- Garbage & Rubbish Removal, Stouffville
- Garment & Linen Services, Stouffville
- Gas Companies, Stouffville
- Gas Pipe, Stouffville
- Gas Station, Stouffville - Service & Filling Station
- General Business Services, Stouffville
- General Hardware Stores, Stouffville
- General Management Consulting Services, Stouffville - Management Consultants
- General Merchandise Stores, Stouffville
- General Travel Agents & Agencies, Stouffville
- Generators, Compressors, Pumps, Motors & Fans, Stouffville
- Gift Shops, Stouffville - Gift, Novelty & Souvenir Stores
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- Gifts, Cards & Stationery Stores, Stouffville
- Glass & Glass Products, Stouffville
- Glass Stained & Leaded, Stouffville
- Golf Cars & Carts, Stouffville
- Golf Clubs Private, Stouffville
- Golf Courses, Stouffville
- Gospel Church, Stouffville
- Government, Stouffville
- Grain Bins, Stouffville
- Graphic Design Services, Stouffville - Graphic Designer
- Graphic Designer & Artist Services, Stouffville
- Greek Restaurants, Stouffville
- Grills & Grilling Equipment & Supplies, Stouffville
- Grocery Stores & Supermarkets, Stouffville
- Ground Transportation, Except Passenger, Stouffville
- Gutter & Flashing Contractors, Stouffville - Metal - Copper Flashing - Gutter Cleaning & Repair Services
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