- Garbage & Rubbish Removal, Brockville
- Garment & Linen Services, Brockville
- Gas & Air Compressors, Brockville
- Gas Appliance Repair, Maintenance & Service, Brockville
- Gas Equipment Industrial, Brockville
- Gas Station, Brockville - Service & Filling Station
- General Business Consulting, Brockville
- General Business Services, Brockville
- General Consultants, Brockville
- General Freight Trucking, Brockville - Motor Freight
- General Management Consulting Services, Brockville - Management Consultants
- General Merchandise Stores, Brockville
- General Travel Agents & Agencies, Brockville
- Generators, Compressors, Pumps, Motors & Fans, Brockville
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- Gifts, Cards & Stationery Stores, Brockville
- Glass & Glass Products, Brockville
- Glass - Auto, Float, Plate, Window & Doors, Brockville
- Golf Courses, Brockville
- Goodyear Tires, Brockville - Dealers
- Government, Brockville
- Graphic Design Services, Brockville - Graphic Designer
- Graphic Designer & Artist Services, Brockville
- Grocery Stores & Supermarkets, Brockville
- Ground Transportation, Except Passenger, Brockville
- Gun Repair & Services, Brockville
- Guns & Gunsmith Services, Brockville
- Gutter & Flashing Contractors, Brockville - Metal - Copper Flashing - Gutter Cleaning & Repair Services
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