- Ice Cream & Frozen Yogurt, Ottawa
- Independent Church, Ottawa
- Industrial & Commercial Cleaning Services & Companies, Ottawa
- Industrial & Commercial Real Estate, Ottawa
- Industrial & Heavy Vehicle Dealers, Ottawa
- Industrial Contractors, Ottawa
- Industrial Equipment & Machinery, Ottawa
- Industrial Goods & Products - Hard Goods - Large, Ottawa
- Industrial Goods & Products - Hard Goods - Small, Ottawa
- Industrial Goods & Products - Soft - Large & Small, Ottawa
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Ottawa
- Industrial Trucks, Ottawa
- Industrial Waste Disposal, Ottawa
- Industrial Waste Recycling, Ottawa
- Industry, Ottawa
- Insecticides, Termite & Pest Control, Ottawa - Pesticides
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- Insurance Brokers, Ottawa
- Insurance Carriers, Ottawa
- Insurance Carriers By Specialty, Ottawa
- Insurance Farm, Ottawa
- Insurance Medicare, Ottawa
- Insurance Services, Ottawa
- Interior Designers, Ottawa
- Interior Designers & Decorators, Ottawa
- Internal Medicine Doctors, Ottawa - Internists Physicians & Surgeons
- International Restaurants, Ottawa
- Internet Providers, Ottawa
- Internet Services, Ottawa
- Investment Management Services, Ottawa
- Investment Services & Advisors, Ottawa
- Iron, Steel & Metal Fabricators, Ottawa - Fabrication Companies
- Italian Restaurants, Ottawa
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