- Ice Cream & Frozen Desserts, Cortland
- Ice Cream & Frozen Yogurt, Cortland
- Ice Wholesale, Cortland - Dry Ice
- Industrial & Commercial Cleaning Services & Companies, Cortland
- Industrial & Heavy Vehicle Dealers, Cortland
- Industrial Contractors, Cortland
- Industrial Equipment & Machinery, Cortland
- Industrial Goods & Products - Hard Goods - Small, Cortland
- Industrial Pumps, Cortland - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Trucks, Cortland
- Industry, Cortland
- Information Bureaus & Services, Cortland
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- Insulation Contractors, Cortland - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Cortland
- Insurance Carriers, Cortland
- Insurance Farm, Cortland
- Insurance General Liability, Cortland
- Insurance Motorcycles, Cortland
- Insurance Renters, Cortland
- Insurance Services, Cortland
- Investment Management Services, Cortland
- Investment Services & Advisors, Cortland
- Italian Restaurants, Cortland
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