- Ice Cream & Frozen Yogurt, Brockville
- Importers, Brockville
- Imprinting & Embossing Services, Brockville
- Industrial & Commercial Cleaning Services & Companies, Brockville
- Industrial & Commercial Real Estate, Brockville
- Industrial & Heavy Equipment Repair & Service, Brockville
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Brockville
- Industrial & Heavy Vehicle Dealers, Brockville
- Industrial Contractors, Brockville
- Industrial Equipment & Machinery, Brockville
- Industrial Equipment & Systems, Brockville
- Industrial Goods & Products - Hard Goods - Large, Brockville
- Industrial Goods & Products - Hard Goods - Small, Brockville
- Industrial Goods & Products - Soft - Large & Small, Brockville
- Industrial Lifts, Brockville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Brockville
- Industrial Pump Repair & Service, Brockville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Brockville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Brockville
- Industrial Waste Disposal, Brockville
- Industrial Waterway & Dock Construction, Brockville
- Industry, Brockville
- Information Bureaus & Services, Brockville
- Information Retrieval Services, Brockville
- Information Technology Services, Brockville - IT Service
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- Inspection & Testing Services, Brockville
- Instrument Repair Service, Brockville
- Insulation Consultants, Brockville
- Insulation Contractors, Brockville - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Brockville
- Insurance Brokers, Brockville
- Insurance Carriers, Brockville
- Insurance Carriers By Specialty, Brockville
- Insurance Claim Processing Services, Brockville
- Insurance Farm, Brockville
- Insurance General Liability, Brockville
- Insurance Motorcycles, Brockville
- Insurance Pet, Brockville
- Insurance Renters, Brockville
- Insurance Services, Brockville
- Insurance Travel, Brockville
- Interior Designers, Brockville
- Interior Designers & Decorators, Brockville
- Interlocking Stone, Brockville
- Internal Medicine Doctors, Brockville - Internists Physicians & Surgeons
- Internet Products - Hardware & Software Providers, Brockville
- Internet Services, Brockville
- Investment Services & Advisors, Brockville
- Irrigation Systems & Equipment, Brockville
- Italian Restaurants, Brockville
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