- Games & Hobbies, Windsor
- Garage Building & Repair, Windsor - Carports - Garage Builders
- Garage, Door & Window Products, Windsor
- Garbage & Rubbish Removal, Windsor
- Garden & Lawn Sprinkler Repair, Installation & Service, Windsor
- Garment & Linen Services, Windsor
- Garment Pressing & Cleaners Agents, Windsor - Laundries & Dry Cleaners
- Gas Station, Windsor - Service & Filling Station
- General Business Consulting, Windsor
- General Business Services, Windsor
- General Consultants, Windsor
- General Freight Trucking, Windsor - Motor Freight
- 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
- Gifts, Cards & Stationery Stores, Windsor
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- Glass & Glazing Contractors, Windsor
- Glass Tinting & Coating, Windsor - Home - Car Window Tinting
- Glassware & Chinaware Repair, Windsor
- Golf Clubs Private, Windsor
- Golf Courses, Windsor
- Government, Windsor
- Grading Contractors, Windsor - Excavating - Excavation Companies
- Graphic Design Services, Windsor - Graphic Designer
- Graphic Designer & Artist Services, Windsor
- Gray & Ductile Iron Foundries, Windsor
- Grocery Store Delivery Service, Windsor
- Grocery Stores & Supermarkets, Windsor
- Ground Transportation, Except Passenger, Windsor
- Group Homes, Windsor
- Gun Repair & Services, Windsor
- Guns & Gunsmith Services, Windsor
- Gymnastics Schools, Windsor
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