- Ice Cream & Frozen Yogurt, New Haven
- Ice Cream Manufacturers Supplies & Equipment, New Haven
- Ice Wholesale, New Haven - Dry Ice
- Ikea Furniture, New Haven
- Import Nonclassifiable Services, New Haven
- Import Services, New Haven
- Importers, New Haven
- Independent Care Services, New Haven
- Independent Church, New Haven
- Indian Restaurants, New Haven
- Individual & Family Information & Referral Services, New Haven
- Individual & Family Services, New Haven
- Industrial & Commercial Cleaning Services & Companies, New Haven
- Industrial & Commercial Real Estate, New Haven
- Industrial & Heavy Equipment Repair & Service, New Haven
- Industrial & Heavy Vehicle Dealers, New Haven
- Industrial Contractors, New Haven
- Industrial Engineers & Designers, New Haven - Architectural Designers
- Industrial Equipment & Machinery, New Haven
- Industrial Equipment & Systems, New Haven
- Industrial Generators, New Haven
- Industrial Goods & Products - Hard Goods - Large, New Haven
- Industrial Goods & Products - Hard Goods - Small, New Haven
- Industrial Goods & Products - Soft - Large & Small, New Haven
- Industrial Lifts, New Haven
- Industrial Machinery Supplies & Equipment - Leasing & Rental, New Haven
- Industrial Maintenance & Cleaning Contractors, New Haven
- Industrial Pumps, New Haven - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, New Haven
- Industrial Trucks, New Haven
- Industry, New Haven
- Information Bureaus & Services, New Haven
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- Information Technology Services, New Haven - IT Service
- Inspection & Testing Services, New Haven
- Instruments, New Haven - Control Equipment
- Insulation Contractors, New Haven - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, New Haven
- Insurance Attorneys & Lawyers, New Haven
- Insurance Attorneys & Lawyers, New Haven
- Insurance Brokers, New Haven
- Insurance Carriers, New Haven
- Insurance Carriers By Specialty, New Haven
- Insurance Claim Processing Services, New Haven
- Insurance Consulting & Information Services, New Haven
- Insurance Farm, New Haven
- Insurance General Liability, New Haven
- Insurance Lawyers & Attorneys, New Haven
- Insurance Motorcycles, New Haven
- Insurance Renters, New Haven
- Insurance Services, New Haven
- Interior Designers, New Haven
- Interior Designers & Decorators, New Haven
- Internal Medicine Doctors, New Haven - Internists Physicians & Surgeons
- Internet - Voice Application, New Haven
- Internet Entertainment, New Haven - Internet Services
- Internet Providers, New Haven
- Internet Services, New Haven
- Investment Bankers, New Haven
- Investment Management Services, New Haven
- Investment Services & Advisors, New Haven
- Invitations & Announcements, New Haven - Baby Announcements, Wedding Invitations, Etc
- Iron, Steel & Metal Fabricators, New Haven - Fabrication Companies
- Irrigation Systems & Equipment, New Haven
- Italian Restaurants, New Haven
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