- Ice Cream & Frozen Yogurt, Hauppauge
- Ice Sports Clubs & Instruction, Hauppauge
- Importers, Hauppauge
- Industrial & Commercial Cleaning Services & Companies, Hauppauge
- Industrial & Commercial Real Estate, Hauppauge
- Industrial & Heavy Equipment Repair & Service, Hauppauge
- Industrial Contractors, Hauppauge
- Industrial Engineers & Designers, Hauppauge - Architectural Designers
- Industrial Equipment & Machinery, Hauppauge
- Industrial Equipment & Systems, Hauppauge
- Industrial Goods & Products - Hard Goods - Large, Hauppauge
- Industrial Goods & Products - Hard Goods - Small, Hauppauge
- Industrial Goods & Products - Soft - Large & Small, Hauppauge
- Industrial Heat & Electrical Supplies & Equipment, Hauppauge
- Industrial Lifts, Hauppauge
- Industrial Machinery Manufacturers, Hauppauge
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Hauppauge
- Industrial Pumps, Hauppauge - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Hauppauge
- Industry, Hauppauge
- Information Bureaus & Services, Hauppauge
- Information Technology Services, Hauppauge - IT Service
- Inspection & Testing Services, Hauppauge
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- Instruments & Control Equipment, Hauppauge
- Insurance Brokers, Hauppauge
- Insurance Carriers, Hauppauge
- Insurance Claim Processing Services, Hauppauge
- Insurance Consulting & Information Services, Hauppauge
- Insurance Farm, Hauppauge
- Insurance General Liability, Hauppauge
- Insurance Motorcycles, Hauppauge
- Insurance Renters, Hauppauge
- Insurance Services, Hauppauge
- Interior Designers, Hauppauge
- Interior Designers & Decorators, Hauppauge
- Internet Entertainment, Hauppauge - Internet Services
- Internet Marketing & Advertising Services, Hauppauge
- Internet Providers, Hauppauge
- Internet Services, Hauppauge
- Internet Websites, Hauppauge - Web Hosting, etc
- Inventory Management Services, Hauppauge - Inventory Service
- Investment Bankers, Hauppauge
- Investment Services & Advisors, Hauppauge
- Investments & Mutual Funds, Hauppauge
- Iron, Steel & Metal Fabricators, Hauppauge - Fabrication Companies
- Italian Restaurants, Hauppauge
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