- Ice Cream & Frozen Yogurt, Jamestown
- Ice Wholesale, Jamestown - Dry Ice
- Ignition Apparatus Manufacturers, Jamestown
- Independent Care Services, Jamestown
- Industrial & Commercial Cleaning Services & Companies, Jamestown
- Industrial & Commercial Real Estate, Jamestown
- Industrial & Heavy Equipment Repair & Service, Jamestown
- Industrial Contractors, Jamestown
- Industrial Equipment & Machinery, Jamestown
- Industrial Goods & Products - Hard Goods - Large, Jamestown
- Industrial Goods & Products - Hard Goods - Small, Jamestown
- Industrial Goods & Products - Soft - Large & Small, Jamestown
- Industrial Lifts, Jamestown
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Jamestown
- Industrial Pump Repair & Service, Jamestown - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Jamestown
- Industrial Waste Recycling, Jamestown
- Industry, Jamestown
- Information Bureaus, Jamestown
- Information Bureaus & Services, Jamestown
- Information Retrieval Services, Jamestown
- Inspection & Testing Services, Jamestown
- Insurance Adjusters, Jamestown
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- Insurance Adjusters Public, Jamestown
- Insurance Brokers, Jamestown
- Insurance Carriers, Jamestown
- Insurance Consulting & Information Services, Jamestown
- Insurance Farm, Jamestown
- Insurance General Liability, Jamestown
- Insurance Major Medical, Jamestown
- Insurance Motorcycles, Jamestown
- Insurance Renters, Jamestown
- Insurance Services, Jamestown
- Interior Designers, Jamestown
- Interior Designers & Decorators, Jamestown
- Internal Medicine Doctors, Jamestown - Internists Physicians & Surgeons
- Internet - Broadband, Jamestown
- Internet Providers, Jamestown
- Internet Services, Jamestown
- Investment Bankers, Jamestown
- Investment Management Services, Jamestown
- Investment Services & Advisors, Jamestown
- Investments & Mutual Funds, Jamestown
- Invitations & Announcements, Jamestown - Baby Announcements, Wedding Invitations, Etc
- Iron, Steel & Metal Fabricators, Jamestown - Fabrication Companies
- Italian Restaurants, Jamestown
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