- Ice Cream & Frozen Yogurt, Jacksonville
- Ice Wholesale, Jacksonville - Dry Ice
- Industrial & Commercial Cleaning Services & Companies, Jacksonville
- Industrial & Commercial Real Estate, Jacksonville
- Industrial & Heavy Equipment Repair & Service, Jacksonville
- Industrial Contractors, Jacksonville
- Industrial Equipment & Machinery, Jacksonville
- Industrial Goods & Products - Hard Goods - Small, Jacksonville
- Industrial Goods & Products - Soft - Large & Small, Jacksonville
- Industrial Machinery Manufacturers, Jacksonville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Jacksonville
- Industrial Supply, Parts & Equipment - Miscellaneous, Jacksonville
- Industry, Jacksonville
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- Information Bureaus & Services, Jacksonville
- Insulation Contractors, Jacksonville - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Jacksonville
- Insurance Farm, Jacksonville
- Interior Designers, Jacksonville
- Interior Designers & Decorators, Jacksonville
- Internal Medicine Doctors, Jacksonville - Internists Physicians & Surgeons
- Internet Services, Jacksonville
- Investment Management Services, Jacksonville
- Investment Services & Advisors, Jacksonville
- Iron, Steel & Metal Fabricators, Jacksonville - Fabrication Companies
- Italian Restaurants, Jacksonville
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