- Gambling & Lottery Services, Windsor
- Gambling Supplies & Equipment, Windsor - Slot Machines, Roulette wheel, Poker Sets, Bingo Supplies, etc
- Games & Hobbies, Windsor
- Garage Building & Repair, Windsor - Carports - Garage Builders
- 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 & Air Compressors, Windsor
- Gas Detection, Asbestos & Lead Contractors, Windsor
- Gas Equipment Industrial, Windsor
- Gas Equipment Repair & Service, Windsor
- Gas Line Installation Contractors, Windsor - Gas Pipe Installation - Repair Service
- Gas Pipe, Windsor
- Gas Piping Contractors, Windsor - Gas Pipe Installation & Repair Service
- Gas Station, Windsor - Service & Filling Station
- Gas Tanks Automotive, Windsor
- Gastroenterologists, Windsor - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gauges, Windsor
- Gauges & Gages, Windsor
- Gazebo Builders, Windsor - Installation, Repair & Maintenance Services
- 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
- Geothermal Heating & Cooling Contractors, Windsor - Geothermal HVAC - Installation
- Gift Baskets, Windsor
- Gift Shops, Windsor - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Windsor
- Gifts Wholesale & Retail, Windsor
- Gifts, Cards & Stationery Stores, Windsor
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- Glass & Glass Products, Windsor
- Glass & Glazing Contractors, Windsor
- Glass - Auto, Float, Plate, Window & Doors, Windsor
- Glass - Beveled, Carved, Etched & Ornamental, Windsor
- Glass Stained & Leaded, Windsor
- Glass Tinting & Coating, Windsor - Home - Car Window Tinting
- Go Kart Tracks, Windsor
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Windsor
- Golf Clubs Private, Windsor
- Golf Courses, Windsor
- Golf Driving Ranges, Windsor
- Golf Equipment & Supplies Stores, Windsor - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Windsor
- Goodyear Tires, Windsor - Dealers
- Gourmet Food Stores, Windsor
- Gourmet Restaurants, Windsor
- Government, Windsor
- Government Contract & Relations Consultants, Windsor
- Government Information & Offices Miscellaneous, Windsor
- Graduation Apparel & Supplies, Windsor
- Graffiti Removal & Protection Services, Windsor
- Granite, Windsor
- Graphic Design Services, Windsor - Graphic Designer
- Graphic Designer & Artist Services, Windsor
- Greek Restaurants, Windsor
- Greeting Card Stores, Windsor
- Grills & Grilling Equipment & Supplies, 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
- Gutter & Flashing Contractors, Windsor - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gym Equipment & Supplies, Windsor
- Gymnastic Clubs, Windsor
- Gymnastics Equipment & Supplies, Windsor
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