- Ice Rinks, Port Hope
- Importers, Port Hope
- Industrial & Commercial Cleaning Services & Companies, Port Hope
- Industrial Contractors, Port Hope
- Industrial Equipment & Machinery, Port Hope
- Industrial Goods & Products - Hard Goods - Large, Port Hope
- Industrial Goods & Products - Hard Goods - Small, Port Hope
- Industrial Goods & Products - Soft - Large & Small, Port Hope
- Industrial Lifts, Port Hope
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Port Hope
- Industrial Patterns, Port Hope
- Industrial Pumps, Port Hope - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Port Hope
- Industrial Waterway & Dock Construction, Port Hope
- Industry, Port Hope
- Information Bureaus & Services, Port Hope
- Inspection & Testing Services, Port Hope
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- Insulation Contractors, Port Hope - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Port Hope
- Insurance Carriers, Port Hope
- Insurance Carriers By Specialty, Port Hope
- Insurance Consulting & Information Services, Port Hope
- Insurance Farm, Port Hope
- Insurance General Liability, Port Hope
- Insurance Services, Port Hope
- Insurance Travel, Port Hope
- Interlocking Stone, Port Hope
- Internet Products - Hardware & Software Providers, Port Hope
- Internet Services, Port Hope
- Investment Management Services, Port Hope
- Investment Services & Advisors, Port Hope
- Iron, Steel & Metal Fabricators, Port Hope - Fabrication Companies
- Italian Restaurants, Port Hope
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