- Ice Cream & Frozen Yogurt, Belleville
- Importers, Belleville
- Industrial & Commercial Real Estate, Belleville
- Industrial & Heavy Equipment Repair & Service, Belleville
- Industrial & Heavy Vehicle Dealers, Belleville
- Industrial & Personal Service Paper, Boxes & Cardboard, Belleville
- Industrial Contractors, Belleville
- Industrial Equipment & Machinery, Belleville
- Industrial Goods & Products - Hard Goods - Large, Belleville
- Industrial Goods & Products - Hard Goods - Small, Belleville
- Industrial Goods & Products - Soft - Large & Small, Belleville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Belleville
- Industrial Maintenance & Cleaning Contractors, Belleville
- Industrial Trucks, Belleville
- Industrial Waste Disposal, Belleville
- Industrial Waste Recycling, Belleville
- Industrial Waterway & Dock Construction, Belleville
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- Industry, Belleville
- Information Retrieval Services, Belleville
- Information Technology Services, Belleville - IT Service
- Inspection & Testing Services, Belleville
- Insulation & Energy Conservation Materials, Belleville
- Insurance Brokers, Belleville
- Insurance Carriers, Belleville
- Insurance Farm, Belleville
- Insurance Services, Belleville
- Interior Designers, Belleville
- Interior Designers & Decorators, Belleville
- Internal Medicine Doctors, Belleville - Internists Physicians & Surgeons
- Investment Services & Advisors, Belleville
- Iron Work Contractors, Belleville
- Iron, Steel & Metal Fabricators, Belleville - Fabrication Companies
- Irrigation Ditch Contractors, Belleville
- Italian Restaurants, Belleville
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