- Gambling & Lottery Services, Oakville
- Games & Hobbies, Oakville
- Games Toys & Childrens Vehicles Manufacturers, Oakville
- Garage Door Repair, Oakville
- Garage Doors & Door Operating Devices, Oakville
- Garage Doors & Gates, Oakville - Stores & Companies - Install & Repair Services
- Garage Equipment & Accessories, Oakville
- Garage, Door & Window Products, Oakville
- Garbage & Rubbish Removal, Oakville
- Garbage Disposals, Oakville
- Garment & Linen Services, Oakville
- Garment Pressing & Cleaners Agents, Oakville - Laundries & Dry Cleaners
- Gas & Air Compressors, Oakville
- Gas Chemicals, Oakville
- Gas Companies, Oakville
- Gas Detection, Asbestos & Lead Contractors, Oakville
- Gas Detectors & Analyzing, Oakville
- Gas Line Installation Contractors, Oakville - Gas Pipe Installation - Repair Service
- Gas Station, Oakville - Service & Filling Station
- Gauges, Oakville
- Gauges & Gages, Oakville
- Gemologist, Oakville
- Gemologists & Jewelers, Oakville
- General Business Consulting, Oakville
- General Business Services, Oakville
- General Consultants, Oakville
- General Freight Trucking, Oakville - Motor Freight
- General Hardware Stores, Oakville
- General Management Consulting Services, Oakville - Management Consultants
- General Merchandise Stores, Oakville
- General Travel Agents & Agencies, Oakville
- Generators, Compressors, Pumps, Motors & Fans, Oakville
- Geographic & Geomatic Products, Oakville
- Geographic & Geomatic Services, Oakville
- Geosynthetics, Oakville
- Gift Baskets, Oakville
- Gift Shops, Oakville - Gift, Novelty & Souvenir Stores
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- Gifts By Type & Occasion, Oakville
- Gifts Wholesale & Retail, Oakville
- Gifts, Cards & Stationery Stores, Oakville
- Glass & Glass Products, Oakville
- Glass & Glazing Contractors, Oakville
- Glass - Auto, Float, Plate, Window & Doors, Oakville
- Glass - Beveled, Carved, Etched & Ornamental, Oakville
- Glass Tinting & Coating, Oakville - Home - Car Window Tinting
- Glass, Plastic & Rubber Working Machinery, Oakville
- Glassware & Chinaware Repair, Oakville
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Oakville
- Golf Cars & Carts, Oakville
- Golf Clubs Private, Oakville
- Golf Courses, Oakville
- Golf Driving Ranges, Oakville
- Golf Equipment & Supplies Stores, Oakville - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Oakville
- Golf Tours, Oakville
- Gourmet Restaurants, Oakville
- Government, Oakville
- Government Contract & Relations Consultants, Oakville
- Government Information & Offices Miscellaneous, Oakville
- Graffiti Removal & Protection Services, Oakville
- Granite, Oakville
- Graphic Design Services, Oakville - Graphic Designer
- Graphic Designer & Artist Services, Oakville
- Graphic Illustrators, Oakville
- Greek Restaurants, Oakville
- Greeting Card Stores, Oakville
- Grills & Grilling Equipment & Supplies, Oakville
- Grocery Stores & Supermarkets, Oakville
- Ground Transportation, Except Passenger, Oakville
- Grouting Contractors, Oakville
- Gummed Tape, Oakville
- Gutter & Flashing Contractors, Oakville - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gymnastic Clubs, Oakville
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