- Ice Cream & Frozen Yogurt, Wilmington
- Ice Cream Retail, Wilmington
- Imprinting & Embossing Services, Wilmington
- Industrial & Commercial Cleaning Services & Companies, Wilmington
- Industrial & Commercial Real Estate, Wilmington
- Industrial & Heavy Equipment Repair & Service, Wilmington
- Industrial Contractors, Wilmington
- Industrial Equipment & Machinery, Wilmington
- Industrial Goods & Products - Hard Goods - Large, Wilmington
- Industrial Goods & Products - Hard Goods - Small, Wilmington
- Industrial Goods & Products - Soft - Large & Small, Wilmington
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Wilmington
- Industrial Pump Repair & Service, Wilmington - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Wilmington
- Industry, Wilmington
- Information Bureaus & Services, Wilmington
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- Information Processing & Retrieval Systems, Wilmington
- Information Technology Services, Wilmington - IT Service
- Instrument Manufacturers, Wilmington
- Insurance Carriers, Wilmington
- Insurance Farm, Wilmington
- Insurance General Liability, Wilmington
- Insurance Motorcycles, Wilmington
- Insurance Renters, Wilmington
- Interior Designers, Wilmington
- Interior Designers & Decorators, Wilmington
- Internal Medicine Doctors, Wilmington - Internists Physicians & Surgeons
- International Restaurants, Wilmington
- Investment Management Services, Wilmington
- Investment Services & Advisors, Wilmington
- Iron, Steel & Metal Fabricators, Wilmington - Fabrication Companies
- Italian Restaurants, Wilmington
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