- Ice Cream & Frozen Desserts, Syosset
- Ice Cream & Frozen Yogurt, Syosset
- Ice Skating Rinks, Syosset
- Ice Sports Clubs & Instruction, Syosset
- Image Consultants Personal, Syosset
- Importers, Syosset
- Imprinting & Embossing Services, Syosset
- Industrial & Commercial Cleaning Services & Companies, Syosset
- Industrial & Commercial Real Estate, Syosset
- Industrial & Personal Service Paper, Boxes & Cardboard, Syosset
- Industrial Engineers & Designers, Syosset - Architectural Designers
- Industrial Equipment & Machinery, Syosset
- Industrial Filters, Syosset
- Industrial Goods & Products - Hard Goods - Large, Syosset
- Industrial Goods & Products - Hard Goods - Small, Syosset
- Industrial Goods & Products - Soft - Large & Small, Syosset
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Syosset
- Industry, Syosset
- Information Bureaus & Services, Syosset
- Information Technology Services, Syosset - IT Service
- Infra Red Equipment & Services, Syosset
- Infrared Spectroscopy Testing Labs, Syosset
- Inspection & Testing Services, Syosset
- Insulation & Energy Conservation Materials, Syosset
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- Insulation Contractors, Syosset - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Syosset
- Insurance Carriers, Syosset
- Insurance Carriers By Specialty, Syosset
- Insurance Claim Processing Services, Syosset
- Insurance Consulting & Information Services, Syosset
- Insurance Farm, Syosset
- Insurance General Liability, Syosset
- Insurance Motorcycles, Syosset
- Insurance Real Property, Syosset
- Insurance Renters, Syosset
- Insurance Services, Syosset
- Interior Designers, Syosset
- Interior Designers & Decorators, Syosset
- Internal Medicine Doctors, Syosset - Internists Physicians & Surgeons
- Internet Marketing & Advertising Services, Syosset
- Internet Providers, Syosset
- Internet Services, Syosset
- Investment Bankers, Syosset
- Investment Services & Advisors, Syosset
- Invitations & Announcements, Syosset - Baby Announcements, Wedding Invitations, Etc
- Irrigation Systems & Equipment, Syosset
- Italian Restaurants, Syosset
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