- Gambling & Lottery Services, Strathroy
- Garment & Linen Services, Strathroy
- Gas Station, Strathroy - Service & Filling Station
- General Business Consulting, Strathroy
- General Business Services, Strathroy
- General Consultants, Strathroy
- General Merchandise Stores, Strathroy
- General Travel Agents & Agencies, Strathroy
- Generators, Compressors, Pumps, Motors & Fans, Strathroy
- Geothermal Heating & Cooling Contractors, Strathroy - Geothermal HVAC - Installation
- Gifts, Cards & Stationery Stores, Strathroy
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- Glass & Fiber Glass Materials, Strathroy - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, Strathroy
- Glass - Auto, Float, Plate, Window & Doors, Strathroy
- Glass Stained & Leaded, Strathroy
- Golf Courses, Strathroy
- Government, Strathroy
- Granite, Strathroy
- Graphic Designer & Artist Services, Strathroy
- Grocery Stores & Supermarkets, Strathroy
- Ground Transportation, Except Passenger, Strathroy
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