- Ice Rinks, Melville
- Ice Sports Clubs & Instruction, Melville
- Imprinting & Embossing Services, Melville
- Individual & Family Information & Referral Services, Melville
- Industrial Contractors, Melville
- Industrial Goods & Products - Hard Goods - Large, Melville
- Industrial Goods & Products - Hard Goods - Small, Melville
- Industrial Goods & Products - Soft - Large & Small, Melville
- Industrial Heaters & Boilers, Melville
- Industrial Lifts, Melville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Melville
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- Industry, Melville
- Information Bureaus & Services, Melville
- Information Retrieval Services, Melville
- Insurance Brokers, Melville
- Insurance Carriers, Melville
- Insurance Services, Melville
- Internet Products - Hardware & Software Providers, Melville
- Internet Services, Melville
- Investment Services & Advisors, Melville
- Italian Restaurants, Melville
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