- Gambling & Lottery Services, St Catharines
- Games & Hobbies, St Catharines
- Garage Door Repair, St Catharines
- Garage Doors & Door Operating Devices, St Catharines
- Garage Doors & Gates, St Catharines - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, St Catharines
- Garbage & Rubbish Removal, St Catharines
- Garbage Disposals, St Catharines
- Garment & Linen Services, St Catharines
- Garment Pressing & Cleaners Agents, St Catharines - Laundries & Dry Cleaners
- Gas Companies, St Catharines
- Gas Detection, Asbestos & Lead Contractors, St Catharines
- Gas Equipment Industrial, St Catharines
- Gas Line Installation Contractors, St Catharines - Gas Pipe Installation - Repair Service
- Gas Station, St Catharines - Service & Filling Station
- Gemologist, St Catharines
- Gemologists & Jewelers, St Catharines
- General Business Consulting, St Catharines
- General Business Services, St Catharines
- General Consultants, St Catharines
- General Freight Trucking, St Catharines - Motor Freight
- General Hardware Stores, St Catharines
- General Management Consulting Services, St Catharines - Management Consultants
- General Merchandise Stores, St Catharines
- General Travel Agents & Agencies, St Catharines
- Generators, Compressors, Pumps, Motors & Fans, St Catharines
- Geothermal Heating & Cooling Contractors, St Catharines - Geothermal HVAC - Installation
- Gift Baskets, St Catharines
- Gift Shops, St Catharines - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, St Catharines
- Gifts Wholesale & Retail, St Catharines
- Gifts, Cards & Stationery Stores, St Catharines
- Glass & Glass Products, St Catharines
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- Glass & Glazing Contractors, St Catharines
- Glass - Auto, Float, Plate, Window & Doors, St Catharines
- Glass Decorative, St Catharines
- Glass Engravers, St Catharines
- Glass Tinting & Coating, St Catharines - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, St Catharines
- Golf Clubs Private, St Catharines
- Golf Courses, St Catharines
- Golf Driving Ranges, St Catharines
- Golf Equipment & Supplies Stores, St Catharines - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, St Catharines
- Goodyear Tires, St Catharines - Dealers
- Gospel Church, St Catharines
- Gourmet Food Stores, St Catharines
- Gourmet Restaurants, St Catharines
- Government, St Catharines
- Graffiti Removal & Protection Services, St Catharines
- Granite, St Catharines
- Graphic Design Services, St Catharines - Graphic Designer
- Graphic Designer & Artist Services, St Catharines
- Grease & Oil Disposal Sites, St Catharines
- Greek Churches, St Catharines
- Greek Restaurants, St Catharines
- Greenhouse Supplies, Kits & Equipment, St Catharines
- Greeting Card Stores, St Catharines
- Grills & Grilling Equipment & Supplies, St Catharines
- Grocery Stores & Supermarkets, St Catharines
- Ground Transportation, Except Passenger, St Catharines
- Guide & Directory Advertising Services, St Catharines
- Gun Repair & Services, St Catharines
- Guns & Gunsmith Services, St Catharines
- Gutter & Flashing Contractors, St Catharines - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gymnastic Clubs, St Catharines
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