- Gambling & Lottery Services, Markham
- Games & Hobbies, Markham
- Games Toys & Childrens Vehicles Manufacturers, Markham
- Garage Door Repair, Markham
- Garage Doors & Door Operating Devices, Markham
- Garage Doors & Gates, Markham - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Markham
- Garbage & Rubbish Removal, Markham
- Garden & Lawn Sprinkler Repair, Installation & Service, Markham
- Garment & Linen Services, Markham
- Garment Pressing & Cleaners Agents, Markham - Laundries & Dry Cleaners
- Gas Companies, Markham
- Gas Detection, Asbestos & Lead Contractors, Markham
- Gas Detectors & Analyzing, Markham
- Gas Line Installation Contractors, Markham - Gas Pipe Installation - Repair Service
- Gas Station, Markham - Service & Filling Station
- Gauges, Markham
- Gauges & Gages, Markham
- Gazebo Builders, Markham - Installation, Repair & Maintenance Services
- General Business Consulting, Markham
- General Business Services, Markham
- General Consultants, Markham
- General Freight Trucking, Markham - Motor Freight
- General Hardware Stores, Markham
- General Management Consultants & Services, Markham
- General Management Consulting Services, Markham - Management Consultants
- General Merchandise Stores, Markham
- General Travel Agents & Agencies, Markham
- Generators, Compressors, Pumps, Motors & Fans, Markham
- Gift Baskets, Markham
- Gift Shops, Markham - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Markham
- Gifts Wholesale & Retail, Markham
- Gifts, Cards & Stationery Stores, Markham
- Glass & Fiber Glass Materials, Markham - Wholesale, Manufacturers & Suppliers
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- Glass & Glass Products, Markham
- Glass & Glazing Contractors, Markham
- Glass - Auto, Float, Plate, Window & Doors, Markham
- Glass - Beveled, Carved, Etched & Ornamental, Markham
- Glass Stained & Leaded, Markham
- Glass Tinting & Coating, Markham - Home - Car Window Tinting
- Glass, Plastic & Rubber Working Machinery, Markham
- Gloves Retail, Markham
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Markham
- Golf Clubs Private, Markham
- Golf Courses, Markham
- Golf Driving Ranges, Markham
- Golf Equipment & Supplies Stores, Markham - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Markham
- Golf Tours, Markham
- Goodyear Tires, Markham - Dealers
- Gospel Church, Markham
- Gourmet Food Stores, Markham
- Government, Markham
- Granite, Markham
- Graphic Design Services, Markham - Graphic Designer
- Graphic Designer & Artist Services, Markham
- Greek Restaurants, Markham
- Greeting Card Stores, Markham
- Grinding Services, Markham
- Grocery Stores & Supermarkets, Markham
- Ground Transportation, Except Passenger, Markham
- Guide & Directory Advertising Services, Markham
- Gummed Tape, Markham
- Gun Repair & Services, Markham
- Guns & Gunsmith Services, Markham
- Gutter & Flashing Contractors, Markham - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gym Equipment & Supplies, Markham
- Gymnastic Clubs, Markham
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