- Ice Cream & Frozen Yogurt, Port Jefferson Station
- Industrial & Commercial Cleaning Services & Companies, Port Jefferson Station
- Industrial & Commercial Real Estate, Port Jefferson Station
- Industrial & Personal Service Paper, Boxes & Cardboard, Port Jefferson Station
- Industrial Contractors, Port Jefferson Station
- Industrial Equipment & Machinery, Port Jefferson Station
- Industrial Goods & Products - Hard Goods - Large, Port Jefferson Station
- Industrial Goods & Products - Hard Goods - Small, Port Jefferson Station
- Industrial Goods & Products - Soft - Large & Small, Port Jefferson Station
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Port Jefferson Station
- Industrial Vehicle Equipment & Supplies, Port Jefferson Station
- Industrial Waterway & Dock Construction, Port Jefferson Station
- Industry, Port Jefferson Station
- Information Bureaus & Services, Port Jefferson Station
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- Insurance Carriers, Port Jefferson Station
- Insurance Disability, Port Jefferson Station
- Insurance Farm, Port Jefferson Station
- Insurance General Liability, Port Jefferson Station
- Insurance Motorcycles, Port Jefferson Station
- Insurance Renters, Port Jefferson Station
- Interior Designers, Port Jefferson Station
- Interior Designers & Decorators, Port Jefferson Station
- Internal Medicine Doctors, Port Jefferson Station - Internists Physicians & Surgeons
- Internet Services, Port Jefferson Station
- Investment Services & Advisors, Port Jefferson Station
- Iron, Steel & Metal Fabricators, Port Jefferson Station - Fabrication Companies
- Irrigation Systems & Equipment, Port Jefferson Station
- Italian Restaurants, Port Jefferson Station
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