- Games & Hobbies, Tillsonburg
- Garage Doors & Door Operating Devices, Tillsonburg
- Garage Doors & Gates, Tillsonburg - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Tillsonburg
- Garment & Linen Services, Tillsonburg
- Garment Pressing & Cleaners Agents, Tillsonburg - Laundries & Dry Cleaners
- Gas Pipe, Tillsonburg
- Gas Station, Tillsonburg - Service & Filling Station
- General Business Consulting, Tillsonburg
- General Business Services, Tillsonburg
- General Consultants, Tillsonburg
- General Hardware Stores, Tillsonburg
- General Merchandise Stores, Tillsonburg
- General Travel Agents & Agencies, Tillsonburg
- Generators, Compressors, Pumps, Motors & Fans, Tillsonburg
- Geothermal Heating & Cooling Contractors, Tillsonburg - Geothermal HVAC - Installation
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- Gifts By Type & Occasion, Tillsonburg
- Gifts, Cards & Stationery Stores, Tillsonburg
- Glass & Glass Products, Tillsonburg
- Glass & Glazing Contractors, Tillsonburg
- Glass - Auto, Float, Plate, Window & Doors, Tillsonburg
- Glass Tinting & Coating, Tillsonburg - Home - Car Window Tinting
- Golf Courses, Tillsonburg
- Golf Driving Ranges, Tillsonburg
- Government, Tillsonburg
- Graphic Design Services, Tillsonburg - Graphic Designer
- Graphic Designer & Artist Services, Tillsonburg
- Greek Churches, Tillsonburg
- Grills & Grilling Equipment & Supplies, Tillsonburg
- Grocery Stores & Supermarkets, Tillsonburg
- Ground Transportation, Except Passenger, Tillsonburg
- Gutter & Flashing Contractors, Tillsonburg - Metal - Copper Flashing - Gutter Cleaning & Repair Services
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