- Games & Hobbies, Windsor
- Garage Door Repair, Windsor
- Garage Doors & Door Operating Devices, Windsor
- Garage Doors & Gates, Windsor - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Windsor
- Garbage & Rubbish Removal, Windsor
- Garment & Linen Services, Windsor
- Garment Pressing & Cleaners Agents, Windsor - Laundries & Dry Cleaners
- Gas Equipment Industrial, Windsor
- Gas Piping Contractors, Windsor - Gas Pipe Installation & Repair Service
- Gas Station, Windsor - Service & Filling Station
- Gastroenterologists, Windsor - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Windsor
- General Business Consulting, Windsor
- General Business Services, Windsor
- General Consultants, Windsor
- General Hardware Stores, Windsor
- General Management Consulting Services, Windsor - Management Consultants
- General Merchandise Stores, Windsor
- General Travel Agents & Agencies, Windsor
- Generators, Compressors, Pumps, Motors & Fans, Windsor
- Geotechnical Soils Engineer, Windsor
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- Gift Shops, Windsor - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Windsor
- Glass & Fiber Glass Materials, Windsor - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, Windsor
- Glass & Glazing Contractors, Windsor
- Glass - Auto, Float, Plate, Window & Doors, Windsor
- Glass Plate Windows, Windsor
- Glass Repair, Windsor - Car, Window, Auto Glass Repair
- Golf Courses, Windsor
- Golf Equipment Repair & Sales, Windsor - Clubs, Carts, Bags & More
- Government, Windsor
- Granite, Windsor
- Graphic Design Services, Windsor - Graphic Designer
- Graphic Designer & Artist Services, Windsor
- Greek Restaurants, Windsor
- Grinding Services, Windsor
- Grocery Stores & Supermarkets, Windsor
- Ground Transportation, Except Passenger, Windsor
- Guide & Directory Advertising Services, Windsor
- Gun Repair & Services, Windsor
- Guns & Gunsmith Services, Windsor
- Gymnastics Schools, Windsor
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