- Ice Cream & Frozen Yogurt, Cortland
- Ice Wholesale, Cortland - Dry Ice
- Ignition Apparatus Manufacturers, Cortland
- Image Processing Supplies & Equipment, Cortland
- Individual & Family Information & Referral Services, Cortland
- Industrial & Commercial Cleaning Services & Companies, Cortland
- Industrial & Commercial Real Estate, Cortland
- Industrial & Heavy Equipment Repair & Service, Cortland
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Cortland
- Industrial & Heavy Vehicle Dealers, Cortland
- Industrial Contractors, Cortland
- Industrial Engineers & Designers, Cortland - Architectural Designers
- Industrial Equipment & Machinery, Cortland
- Industrial Filters, Cortland
- Industrial Goods & Products - Hard Goods - Large, Cortland
- Industrial Goods & Products - Hard Goods - Small, Cortland
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Cortland
- Industrial Supply, Parts & Equipment - Miscellaneous, Cortland
- Industrial Waste Recycling, Cortland
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- Industry, Cortland
- Information Bureaus & Services, Cortland
- Inspection & Testing Services, Cortland
- Insulation Contractors, Cortland - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Cortland
- Insurance Claim Processing Services, Cortland
- Insurance Consulting & Information Services, Cortland
- Insurance General Liability, Cortland
- Insurance Motorcycles, Cortland
- Insurance Renters, Cortland
- Insurance Services, Cortland
- Internal Medicine Doctors, Cortland - Internists Physicians & Surgeons
- Internet Providers, Cortland
- Internet Services, Cortland
- Investment Management Services, Cortland
- Investment Services & Advisors, Cortland
- Iron, Steel & Metal Fabricators, Cortland - Fabrication Companies
- Italian Restaurants, Cortland
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