- Ice Cream & Frozen Yogurt, Portsmouth
- Ice Wholesale, Portsmouth - Dry Ice
- Imported Auto Parts, Portsmouth
- Importers, Portsmouth
- Industrial & Commercial Cleaning Services & Companies, Portsmouth
- Industrial & Commercial Real Estate, Portsmouth
- Industrial & Heavy Equipment Repair & Service, Portsmouth
- Industrial & Heavy Vehicle Dealers, Portsmouth
- Industrial & Personal Service Paper, Boxes & Cardboard, Portsmouth
- Industrial Contractors, Portsmouth
- Industrial Equipment & Machinery, Portsmouth
- Industrial Goods & Products - Hard Goods - Large, Portsmouth
- Industrial Goods & Products - Hard Goods - Small, Portsmouth
- Industrial Goods & Products - Soft - Large & Small, Portsmouth
- Industrial Lifts, Portsmouth
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Portsmouth
- Industrial Maintenance & Cleaning Contractors, Portsmouth
- Industrial Pump Repair & Service, Portsmouth - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Portsmouth - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Portsmouth
- Industrial Trucks, Portsmouth
- Industrial Waste Disposal, Portsmouth
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- Industrial Waste Recycling, Portsmouth
- Industry, Portsmouth
- Information Bureaus & Services, Portsmouth
- Information Technology Services, Portsmouth - IT Service
- Insurance Accident, Portsmouth
- Insurance Brokers, Portsmouth
- Insurance Carriers, Portsmouth
- Insurance Consulting & Information Services, Portsmouth
- Insurance Farm, Portsmouth
- Insurance General Liability, Portsmouth
- Insurance Motorcycles, Portsmouth
- Insurance Renters, Portsmouth
- Insurance Services, Portsmouth
- Internal Medicine Doctors, Portsmouth - Internists Physicians & Surgeons
- Internet - Voice Application, Portsmouth
- Internet Marketing & Advertising Services, Portsmouth
- Internet Providers, Portsmouth
- Internet Services, Portsmouth
- Investment Management Services, Portsmouth
- Investment Services & Advisors, Portsmouth
- Italian Food Products, Portsmouth
- Italian Restaurants, Portsmouth
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