- Gambling & Lottery Services, Ajax
- Games & Hobbies, Ajax
- Garage Door Repair, Ajax
- Garage Doors & Door Operating Devices, Ajax
- Garage Doors & Gates, Ajax - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Ajax
- Garbage & Rubbish Removal, Ajax
- Garment & Linen Services, Ajax
- Garment Pressing & Cleaners Agents, Ajax - Laundries & Dry Cleaners
- Gas & Air Compressors, Ajax
- Gas Companies, Ajax
- Gas Line Installation Contractors, Ajax - Gas Pipe Installation - Repair Service
- Gas Station, Ajax - Service & Filling Station
- Gastroenterologists, Ajax - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Ajax
- General Business Consulting, Ajax
- General Business Services, Ajax
- General Consultants, Ajax
- General Freight Trucking, Ajax - Motor Freight
- General Hardware Stores, Ajax
- General Management Consulting Services, Ajax - Management Consultants
- General Merchandise Stores, Ajax
- General Travel Agents & Agencies, Ajax
- Generators, Compressors, Pumps, Motors & Fans, Ajax
- Geothermal Heating & Cooling Contractors, Ajax - Geothermal HVAC - Installation
- Gift Baskets, Ajax
- Gifts By Type & Occasion, Ajax
- Gifts, Cards & Stationery Stores, Ajax
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- Glass & Fiber Glass Materials, Ajax - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, Ajax
- Glass & Glazing Contractors, Ajax
- Glass - Auto, Float, Plate, Window & Doors, Ajax
- Glass Products Manufacturers, Ajax
- Glass Tinting & Coating, Ajax - Home - Car Window Tinting
- Go Kart Tracks, Ajax
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Ajax
- Golf Courses, Ajax
- Golf Driving Ranges, Ajax
- Golf Equipment & Supplies Stores, Ajax - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Ajax
- Gospel Church, Ajax
- Gourmet Restaurants, Ajax
- Government, Ajax
- Graffiti Removal & Protection Services, Ajax
- Granite, Ajax
- Graphic Design Services, Ajax - Graphic Designer
- Graphic Designer & Artist Services, Ajax
- Greeting Card Stores, Ajax
- Grills & Grilling Equipment & Supplies, Ajax
- Grinding Services, Ajax
- Grocery Stores & Supermarkets, Ajax
- Ground Transportation, Except Passenger, Ajax
- Gummed Tape, Ajax
- Gun Repair & Services, Ajax
- Guns & Gunsmith Services, Ajax
- Gutter & Flashing Contractors, Ajax - Metal - Copper Flashing - Gutter Cleaning & Repair Services
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