- Ice Cream & Frozen Yogurt, Plattsburgh
- Ice Skating Rinks, Plattsburgh
- Ignition Apparatus Manufacturers, Plattsburgh
- Importers, Plattsburgh
- Independent Church, Plattsburgh
- Indian Restaurants, Plattsburgh
- Individual & Family Information & Referral Services, Plattsburgh
- Industrial & Commercial Cleaning Services & Companies, Plattsburgh
- Industrial & Commercial Real Estate, Plattsburgh
- Industrial & Heavy Equipment Repair & Service, Plattsburgh
- Industrial & Personal Service Paper, Boxes & Cardboard, Plattsburgh
- Industrial Contractors, Plattsburgh
- Industrial Developers, Plattsburgh
- Industrial Engineers & Designers, Plattsburgh - Architectural Designers
- Industrial Equipment & Machinery, Plattsburgh
- Industrial Goods & Products - Hard Goods - Large, Plattsburgh
- Industrial Goods & Products - Hard Goods - Small, Plattsburgh
- Industrial Goods & Products - Soft - Large & Small, Plattsburgh
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Plattsburgh
- Industrial Supply, Parts & Equipment - Miscellaneous, Plattsburgh
- Industrial Vehicle Equipment & Supplies, Plattsburgh
- Industry, Plattsburgh
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- Information Bureaus & Services, Plattsburgh
- Insulation & Energy Conservation Materials, Plattsburgh
- Insulation Contractors, Plattsburgh - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Plattsburgh
- Insurance Brokers, Plattsburgh
- Insurance Carriers, Plattsburgh
- Insurance Farm, Plattsburgh
- Insurance General Liability, Plattsburgh
- Insurance Major Medical, Plattsburgh
- Insurance Motorcycles, Plattsburgh
- Insurance Renters, Plattsburgh
- Insurance Services, Plattsburgh
- Interior Designers, Plattsburgh
- Interior Designers & Decorators, Plattsburgh
- Internet Marketing & Advertising Services, Plattsburgh
- Internet Providers, Plattsburgh
- Internet Services, Plattsburgh
- Investment Management Services, Plattsburgh
- Investment Services & Advisors, Plattsburgh
- Invitations & Announcements, Plattsburgh - Baby Announcements, Wedding Invitations, Etc
- Iron, Steel & Metal Fabricators, Plattsburgh - Fabrication Companies
- Italian Restaurants, Plattsburgh
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