- Ice Cream & Frozen Yogurt, Markham
- Ice Rinks, Markham
- Ice Skating Clubs, Markham
- Ice Sports Clubs & Instruction, Markham
- Ice Wholesale, Markham - Dry Ice
- Image Consultants Personal, Markham
- Immigration & Naturalization Consultants, Markham
- Imported Auto Parts, Markham
- Importers, Markham
- Imprinting & Embossing Services, Markham
- Indian Restaurants, Markham
- Industrial & Commercial Cleaning Services & Companies, Markham
- Industrial & Commercial Real Estate, Markham
- Industrial & Heavy Equipment Repair & Service, Markham
- Industrial & Heavy Vehicle Dealers, Markham
- Industrial & Personal Service Paper, Boxes & Cardboard, Markham
- Industrial Contractors, Markham
- Industrial Diamonds, Markham
- Industrial Engineers & Designers, Markham - Architectural Designers
- Industrial Equipment & Machinery, Markham
- Industrial Equipment & Machinery - Other, Markham
- Industrial Equipment & Systems, Markham
- Industrial Generators, Markham
- Industrial Goods & Products - Hard Goods - Large, Markham
- Industrial Goods & Products - Hard Goods - Small, Markham
- Industrial Goods & Products - Soft - Large & Small, Markham
- Industrial Heat & Electrical Supplies & Equipment, Markham
- Industrial Lifts, Markham
- Industrial Machinery Manufacturers, Markham
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Markham
- Industrial Pump Repair & Service, Markham - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Markham - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Markham
- Industrial Vehicle Repair, Markham
- Industry, Markham
- Information Bureaus & Services, Markham
- Information Consultants, Markham
- Information Retrieval Services, Markham
- Information Technology Services, Markham - IT Service
- Inks, Markham
- Inks - Manufacturing, Markham
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- Insolvency Consultants, Markham
- Inspection & Testing Services, Markham
- Inspection Devices Industrial, Markham
- Instrument Repair Service, Markham
- Instruments, Markham - Control Equipment
- Instruments & Control Equipment, Markham
- Insulation & Energy Conservation Materials, Markham
- Insulation Contractors, Markham - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Markham
- Insurance Advisors, Markham
- Insurance Appraisal, Markham
- Insurance Brokers, Markham
- Insurance Carriers, Markham
- Insurance Carriers By Specialty, Markham
- Insurance Chartered Life Underwriters, Markham
- Insurance Claim Processing Services, Markham
- Insurance Consulting & Information Services, Markham
- Insurance Farm, Markham
- Insurance General Liability, Markham
- Insurance Major Medical, Markham
- Insurance Medical Examinations, Markham
- Insurance Motorcycles, Markham
- Insurance Renters, Markham
- Insurance Services, Markham
- Insurance Third Party Administrators, Markham
- Insurance Travel, Markham
- Interior Designers, Markham
- Interior Designers & Decorators, Markham
- Interlocking Stone, Markham
- Internet Products - Hardware & Software Providers, Markham
- Internet Providers, Markham
- Internet Services, Markham
- Inventory Management Services, Markham - Inventory Service
- Investment Management Services, Markham
- Investment Services & Advisors, Markham
- Investments & Mutual Funds, Markham
- Invitations & Announcements, Markham - Baby Announcements, Wedding Invitations, Etc
- Iron, Steel & Metal Fabricators, Markham - Fabrication Companies
- Irrigation Systems & Equipment, Markham
- Italian Restaurants, Markham
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