- Ice Cream & Frozen Yogurt, Jamestown
- Industrial & Commercial Cleaning Services & Companies, Jamestown
- Industrial & Commercial Real Estate, Jamestown
- Industrial & Heavy Equipment Repair & Service, Jamestown
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Jamestown
- Industrial Contractors, Jamestown
- Industrial Equipment & Machinery, Jamestown
- Industrial Equipment & Machinery - Other, Jamestown
- Industrial Goods & Products - Hard Goods - Large, Jamestown
- Industrial Goods & Products - Hard Goods - Small, Jamestown
- Industrial Goods & Products - Soft - Large & Small, Jamestown
- Industrial Heaters & Boilers, Jamestown
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Jamestown
- Industrial Vehicle Repair, Jamestown
- Industry, Jamestown
- Information Bureaus & Services, Jamestown
- Insulation Contractors, Jamestown - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
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- Insurance Adjusters, Jamestown
- Insurance Brokers, Jamestown
- Insurance Carriers, Jamestown
- Insurance Consulting & Information Services, Jamestown
- Insurance Farm, Jamestown
- Insurance General Liability, Jamestown
- Insurance Major Medical, Jamestown
- Insurance Services, Jamestown
- Interior Designers & Decorators, Jamestown
- Internet Providers, Jamestown
- Internet Services, Jamestown
- Investment Bankers, Jamestown
- Investment Management Services, Jamestown
- Investment Services & Advisors, Jamestown
- Iron, Steel & Metal Fabricators, Jamestown - Fabrication Companies
- Irrigation Systems & Equipment, Jamestown
- Italian Restaurants, Jamestown
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