- Gambling & Lottery Services, Welland
- Games & Hobbies, Welland
- Garage Doors & Door Operating Devices, Welland
- Garage Doors & Gates, Welland - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Welland
- Garment & Linen Services, Welland
- Garment Pressing & Cleaners Agents, Welland - Laundries & Dry Cleaners
- Gas Companies, Welland
- Gas Station, Welland - Service & Filling Station
- General Business Services, Welland
- General Freight Trucking, Welland - Motor Freight
- General Hardware Stores, Welland
- General Management Consulting Services, Welland - Management Consultants
- General Merchandise Stores, Welland
- General Travel Agents & Agencies, Welland
- Generators, Compressors, Pumps, Motors & Fans, Welland
- Gifts By Type & Occasion, Welland
- Gifts, Cards & Stationery Stores, Welland
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- Glass & Glass Products, Welland
- Glass - Auto, Float, Plate, Window & Doors, Welland
- Golf Courses, Welland
- Golf Driving Ranges, Welland
- Golf Equipment & Supplies Stores, Welland - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gospel Church, Welland
- Government, Welland
- Government Contract & Relations Consultants, Welland
- Government Information & Offices Miscellaneous, Welland
- Granite, Welland
- Graphic Design Services, Welland - Graphic Designer
- Graphic Designer & Artist Services, Welland
- Greek Churches, Welland
- Greeting Card Stores, Welland
- Grocery Stores & Supermarkets, Welland
- Ground Transportation, Except Passenger, Welland
- Gutter & Flashing Contractors, Welland - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gymnastic Clubs, Welland
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