- Ice Cream & Frozen Yogurt, East Hampton
- Importers, East Hampton
- Industrial & Commercial Cleaning Services & Companies, East Hampton
- Industrial & Commercial Real Estate, East Hampton
- Industrial Contractors, East Hampton
- Industrial Equipment & Machinery, East Hampton
- Industrial Goods & Products - Hard Goods - Large, East Hampton
- Industrial Goods & Products - Hard Goods - Small, East Hampton
- Industrial Goods & Products - Soft - Large & Small, East Hampton
- Industrial Heaters & Boilers, East Hampton
- Industrial Machinery Supplies & Equipment - Leasing & Rental, East Hampton
- Industry, East Hampton
- Insecticides, Termite & Pest Control, East Hampton - Pesticides
- Inspection & Testing Services, East Hampton
- Insulation & Energy Conservation Materials, East Hampton
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- Insulation Contractors, East Hampton - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, East Hampton
- Insurance Carriers By Specialty, East Hampton
- Insurance Consulting & Information Services, East Hampton
- Insurance Pet, East Hampton
- Insurance Services, East Hampton
- Interior Designers, East Hampton
- Interior Designers & Decorators, East Hampton
- Internal Medicine Doctors, East Hampton - Internists Physicians & Surgeons
- Internet Providers, East Hampton
- Internet Services, East Hampton
- Investment Services & Advisors, East Hampton
- Iron, Steel & Metal Fabricators, East Hampton - Fabrication Companies
- Irrigation Systems & Equipment, East Hampton
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