- Ice Cream & Frozen Yogurt, Port Washington
- Ice Skating Rinks, Port Washington
- Identification Equipment, Port Washington
- Identification Equipment Supplies & Services, Port Washington
- Importers, Port Washington
- Individual & Family Information & Referral Services, Port Washington
- Industrial & Commercial Cleaning Services & Companies, Port Washington
- Industrial & Commercial Real Estate, Port Washington
- Industrial & Personal Service Paper, Boxes & Cardboard, Port Washington
- Industrial Contractors, Port Washington
- Industrial Engineers & Designers, Port Washington - Architectural Designers
- Industrial Equipment & Machinery, Port Washington
- Industrial Filters, Port Washington
- Industrial Goods & Products - Hard Goods - Large, Port Washington
- Industrial Goods & Products - Hard Goods - Small, Port Washington
- Industrial Goods & Products - Soft - Large & Small, Port Washington
- Industrial Machinery Manufacturers, Port Washington
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Port Washington
- Industrial Supply, Parts & Equipment - Miscellaneous, Port Washington
- Industry, Port Washington
- Information Bureaus & Services, Port Washington
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- Information Retrieval Services, Port Washington
- Information Technology Services, Port Washington - IT Service
- Insecticides, Termite & Pest Control, Port Washington - Pesticides
- Inspection & Testing Services, Port Washington
- Insurance Adjusters, Port Washington
- Insurance Carriers, Port Washington
- Insurance Consulting & Information Services, Port Washington
- Insurance Farm, Port Washington
- Insurance General Liability, Port Washington
- Insurance Motorcycles, Port Washington
- Insurance Renters, Port Washington
- Insurance Services, Port Washington
- Insurance Trucking, Port Washington
- Interdenominational Church, Port Washington
- Interior Designers, Port Washington
- Interior Designers & Decorators, Port Washington
- Internet Services, Port Washington
- Investment Services & Advisors, Port Washington
- Invitations & Announcements, Port Washington - Baby Announcements, Wedding Invitations, Etc
- Italian Restaurants, Port Washington
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