- Ice Cream & Frozen Yogurt, Amityville
- Ignition Apparatus Manufacturers, Amityville
- Importers, Amityville
- Industrial & Commercial Cleaning Services & Companies, Amityville
- Industrial & Commercial Real Estate, Amityville
- Industrial & Heavy Equipment Repair & Service, Amityville
- Industrial Contractors, Amityville
- Industrial Equipment & Machinery, Amityville
- Industrial Equipment & Machinery - Other, Amityville
- Industrial Goods & Products - Hard Goods - Large, Amityville
- Industrial Goods & Products - Hard Goods - Small, Amityville
- Industrial Lifts, Amityville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Amityville
- Industry, Amityville
- Information Technology Services, Amityville - IT Service
- Insurance Brokers, Amityville
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- Insurance Carriers, Amityville
- Insurance Consulting & Information Services, Amityville
- Insurance Farm, Amityville
- Insurance General Liability, Amityville
- Insurance Motorcycles, Amityville
- Insurance Renters, Amityville
- Insurance Services, Amityville
- Interior Designers, Amityville
- Interior Designers & Decorators, Amityville
- Internet Development, Amityville
- Internet Home Page Development & Consulting, Amityville
- Internet Providers, Amityville
- Internet Services, Amityville
- Investment Services & Advisors, Amityville
- Italian Restaurants, Amityville
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