- Ice Cream & Frozen Yogurt, Fort Erie
- Ice Skating Clubs, Fort Erie
- Immigration & Naturalization Consultants, Fort Erie
- Industrial & Farm Equipment, Fort Erie
- Industrial Contractors, Fort Erie
- Industrial Equipment & Machinery, Fort Erie
- Industrial Generators, Fort Erie
- Industrial Goods & Products - Hard Goods - Large, Fort Erie
- Industrial Goods & Products - Hard Goods - Small, Fort Erie
- Industrial Goods & Products - Soft - Large & Small, Fort Erie
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Fort Erie
- Industrial Pumps, Fort Erie - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Fort Erie
- Industry, Fort Erie
- Information Bureaus & Services, Fort Erie
- Information Retrieval Services, Fort Erie
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- Insolvency Consultants, Fort Erie
- Inspection & Testing Services, Fort Erie
- Insurance Brokers, Fort Erie
- Insurance Carriers, Fort Erie
- Insurance Carriers By Specialty, Fort Erie
- Insurance Farm, Fort Erie
- Insurance Services, Fort Erie
- Insurance Travel, Fort Erie
- Internal Medicine Doctors, Fort Erie - Internists Physicians & Surgeons
- International Trade Consultants, Fort Erie - Foreign Trade
- Internet Products - Hardware & Software Providers, Fort Erie
- Internet Services, Fort Erie
- Investment Services & Advisors, Fort Erie
- Iron, Steel & Metal Fabricators, Fort Erie - Fabrication Companies
- Italian Restaurants, Fort Erie
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