- Gambling & Lottery Services, Barrie
- Games & Hobbies, Barrie
- Garage Doors & Door Operating Devices, Barrie
- Garage Doors & Gates, Barrie - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Barrie
- Garbage & Rubbish Removal, Barrie
- Garbage Disposals, Barrie
- Garment & Linen Services, Barrie
- Gas Appliance Repair, Maintenance & Service, Barrie
- Gas Companies, Barrie
- Gas Engine, Barrie
- Gas Equipment Industrial, Barrie
- Gas Line Installation Contractors, Barrie - Gas Pipe Installation - Repair Service
- Gas Pipe, Barrie
- Gas Piping Contractors, Barrie - Gas Pipe Installation & Repair Service
- Gas Station, Barrie - Service & Filling Station
- Gemologists & Jewelers, Barrie
- General Business Consulting, Barrie
- General Business Services, Barrie
- General Consultants, Barrie
- General Freight Trucking, Barrie - Motor Freight
- General Hardware Stores, Barrie
- General Management Consulting Services, Barrie - Management Consultants
- General Merchandise Stores, Barrie
- General Travel Agents & Agencies, Barrie
- Generators, Compressors, Pumps, Motors & Fans, Barrie
- Geothermal Heating & Cooling Contractors, Barrie - Geothermal HVAC - Installation
- Gift Baskets, Barrie
- Gift Shops, Barrie - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Barrie
- Gifts Wholesale & Retail, Barrie
- Gifts, Cards & Stationery Stores, Barrie
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- Glass & Glass Products, Barrie
- Glass & Glazing Contractors, Barrie
- Glass - Auto, Float, Plate, Window & Doors, Barrie
- Glass - Beveled, Carved, Etched & Ornamental, Barrie
- Glass Stained & Leaded, Barrie
- Glass Tinting & Coating, Barrie - Home - Car Window Tinting
- Go Kart Tracks, Barrie
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Barrie
- Golf Clubs Private, Barrie
- Golf Courses, Barrie
- Golf Driving Ranges, Barrie
- Golf Equipment & Supplies Stores, Barrie - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Barrie
- Golf Tours, Barrie
- Goodyear Tires, Barrie - Dealers
- Gourmet Restaurants, Barrie
- Government, Barrie
- Graffiti Removal & Protection Services, Barrie
- Granite, Barrie
- Graphic Design Services, Barrie - Graphic Designer
- Graphic Designer & Artist Services, Barrie
- Greeting Card Stores, Barrie
- Grills & Grilling Equipment & Supplies, Barrie
- Grinding Services, Barrie
- Grocery Stores & Supermarkets, Barrie
- Ground Transportation, Except Passenger, Barrie
- Gummed Tape, Barrie
- Gun Repair & Services, Barrie
- Guns & Gunsmith Services, Barrie
- Gutter & Flashing Contractors, Barrie - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gymnastic Clubs, Barrie
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