- Ice Carvers, East Hartford
- Ice Cream & Frozen Yogurt, East Hartford
- Ice Skating Rinks, East Hartford
- Ice Wholesale, East Hartford - Dry Ice
- Immigration & Naturalization Services, East Hartford
- Indian Restaurants, East Hartford
- Industrial & Commercial Cleaning Services & Companies, East Hartford
- Industrial & Commercial Real Estate, East Hartford
- Industrial & Heavy Vehicle Dealers, East Hartford
- Industrial & Personal Service Paper, Boxes & Cardboard, East Hartford
- Industrial Contractors, East Hartford
- Industrial Engines, East Hartford
- Industrial Equipment & Machinery, East Hartford
- Industrial Goods & Products - Hard Goods - Large, East Hartford
- Industrial Goods & Products - Hard Goods - Small, East Hartford
- Industrial Goods & Products - Soft - Large & Small, East Hartford
- Industrial Heaters & Boilers, East Hartford
- Industrial Machinery Supplies & Equipment - Leasing & Rental, East Hartford
- Industrial Pumps, East Hartford - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, East Hartford
- Industrial Tanks, East Hartford
- Industry, East Hartford
- Information Bureaus & Services, East Hartford
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- Information Technology Services, East Hartford - IT Service
- Instruments, East Hartford - Control Equipment
- Insulation & Energy Conservation Materials, East Hartford
- Insurance Brokers, East Hartford
- Insurance Carriers, East Hartford
- Insurance Consulting & Information Services, East Hartford
- Insurance Farm, East Hartford
- Insurance General Liability, East Hartford
- Insurance Motorcycles, East Hartford
- Insurance Referral & Information Services, East Hartford
- Insurance Renters, East Hartford
- Insurance Services, East Hartford
- Insurance Travel, East Hartford
- Intercom Systems & Services, East Hartford
- Internal Medicine Doctors, East Hartford - Internists Physicians & Surgeons
- International Affairs, East Hartford
- Internet - Voice Application, East Hartford
- Internet Providers, East Hartford
- Internet Services, East Hartford
- Inventory Management Services, East Hartford - Inventory Service
- Investment Services & Advisors, East Hartford
- Irrigation Systems & Equipment, East Hartford
- Italian Restaurants, East Hartford
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