- Ice Cream & Frozen Yogurt, Oakville
- Ice Rinks, Oakville
- Ice Sports Clubs & Instruction, Oakville
- Immigration & Naturalization Consultants, Oakville
- Importers, Oakville
- Imprinting & Embossing Services, Oakville
- In Home Services, Oakville
- Individual & Family Information & Referral Services, Oakville
- Industrial & Commercial Cleaning Services & Companies, Oakville
- Industrial & Commercial Real Estate, Oakville
- Industrial & Farm Equipment, Oakville
- Industrial & Heavy Equipment Repair & Service, Oakville
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Oakville
- Industrial & Heavy Vehicle Dealers, Oakville
- Industrial & Personal Service Paper, Boxes & Cardboard, Oakville
- Industrial Contractors, Oakville
- Industrial Equipment & Machinery, Oakville
- Industrial Equipment & Machinery - Other, Oakville
- Industrial Equipment & Systems, Oakville
- Industrial Filters, Oakville
- Industrial Generators, Oakville
- Industrial Goods & Products - Hard Goods - Large, Oakville
- Industrial Goods & Products - Hard Goods - Small, Oakville
- Industrial Goods & Products - Soft - Large & Small, Oakville
- Industrial Heat & Electrical Supplies & Equipment, Oakville
- Industrial Heaters & Boilers, Oakville
- Industrial Lifts, Oakville
- Industrial Machinery Manufacturers, Oakville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Oakville
- Industrial Pump Repair & Service, Oakville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Oakville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Oakville
- Industrial Tanks, Oakville
- Industrial Vehicle Equipment & Supplies, Oakville
- Industrial Waste Disposal, Oakville
- Industrial Winches, Oakville
- Industry, Oakville
- Information Bureaus & Services, Oakville
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- Information Consultants, Oakville
- Information Retrieval Services, Oakville
- Inks, Oakville
- Inks - Manufacturing, Oakville
- Insolvency Consultants, Oakville
- Inspection & Testing Services, Oakville
- Instrument Repair Service, Oakville
- Instruments, Oakville - Control Equipment
- Instruments & Control Equipment, Oakville
- Insulation & Energy Conservation Materials, Oakville
- Insulation Contractors, Oakville - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Advisors, Oakville
- Insurance Brokers, Oakville
- Insurance Carriers, Oakville
- Insurance Carriers By Specialty, Oakville
- Insurance Claim Processing Services, Oakville
- Insurance Consulting & Information Services, Oakville
- Insurance Farm, Oakville
- Insurance General Liability, Oakville
- Insurance Medical Examinations, Oakville
- Insurance Motorcycles, Oakville
- Insurance Pet, Oakville
- Insurance Renters, Oakville
- Insurance Services, Oakville
- Insurance Travel, Oakville
- Interior Designers, Oakville
- Interior Designers & Decorators, Oakville
- Interlocking Stone, Oakville
- International Business Development, Oakville
- Internet Products - Hardware & Software Providers, Oakville
- Internet Services, Oakville
- Investment Management Services, Oakville
- Investment Services & Advisors, Oakville
- Investments & Mutual Funds, Oakville
- Irish Restaurants, Oakville
- Iron, Steel & Metal Fabricators, Oakville - Fabrication Companies
- Irrigation Systems & Equipment, Oakville
- Italian Restaurants, Oakville
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