- Garbage & Rubbish Removal, Port Colborne
- Garment & Linen Services, Port Colborne
- Gas Engine, Port Colborne
- Gas Station, Port Colborne - Service & Filling Station
- General Business Services, Port Colborne
- General Freight Trucking, Port Colborne - Motor Freight
- General Management Consulting Services, Port Colborne - Management Consultants
- General Merchandise Stores, Port Colborne
- General Travel Agents & Agencies, Port Colborne
- Gift Shops, Port Colborne - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Port Colborne
- Glass & Glass Products, Port Colborne
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- Glass - Auto, Float, Plate, Window & Doors, Port Colborne
- Golf Clubs Private, Port Colborne
- Golf Courses, Port Colborne
- Golf Driving Ranges, Port Colborne
- Gospel Church, Port Colborne
- Gourmet Restaurants, Port Colborne
- Government, Port Colborne
- Grocery Stores & Supermarkets, Port Colborne
- Ground Transportation, Except Passenger, Port Colborne
- Gun Repair & Services, Port Colborne
- Guns & Gunsmith Services, Port Colborne
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