- Ice Cream & Frozen Yogurt, West Haven
- Ice Wholesale, West Haven - Dry Ice
- Immigration & Naturalization Consultants, West Haven
- Imprinting & Embossing Services, West Haven
- Industrial & Commercial Cleaning Services & Companies, West Haven
- Industrial & Commercial Real Estate, West Haven
- Industrial & Heavy Equipment Repair & Service, West Haven
- Industrial & Heavy Vehicle Dealers, West Haven
- Industrial Contractors, West Haven
- Industrial Equipment & Machinery, West Haven
- Industrial Goods & Products - Hard Goods - Small, West Haven
- Industrial Goods & Products - Soft - Large & Small, West Haven
- Industrial Machinery Manufacturers, West Haven
- Industrial Machinery Supplies & Equipment - Leasing & Rental, West Haven
- Industrial Pumps, West Haven - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Trucks, West Haven
- Industry, West Haven
- Information Bureaus & Services, West Haven
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- Information Technology Services, West Haven - IT Service
- Inspection & Testing Services, West Haven
- Insulation Contractors, West Haven - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, West Haven
- Insurance Carriers By Specialty, West Haven
- Insurance Farm, West Haven
- Insurance Flood, West Haven
- Insurance General Liability, West Haven
- Insurance Motorcycles, West Haven
- Insurance Renters, West Haven
- Insurance Services, West Haven
- Interior Designers & Decorators, West Haven
- Internal Medicine Doctors, West Haven - Internists Physicians & Surgeons
- Internet Providers, West Haven
- Internet Services, West Haven
- Investment Services & Advisors, West Haven
- Italian Restaurants, West Haven
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