- Ice Cream & Frozen Yogurt, Portsmouth
- Industrial & Commercial Cleaning Services & Companies, Portsmouth
- Industrial Contractors, Portsmouth
- Industrial Goods & Products - Hard Goods - Large, Portsmouth
- Industrial Goods & Products - Hard Goods - Small, Portsmouth
- Industrial Heaters & Boilers, Portsmouth
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Portsmouth
- Industrial Supply, Parts & Equipment - Miscellaneous, Portsmouth
- Industry, Portsmouth
- Infectious Disease Specialists, Portsmouth - Doctors, Physicians & Surgeons
- Information Bureaus & Services, Portsmouth
- Inspection & Testing Services, Portsmouth
- Insulation Contractors, Portsmouth - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
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- Insurance Adjusters, Portsmouth
- Insurance Brokers, Portsmouth
- Insurance Carriers, Portsmouth
- Insurance Consulting & Information Services, Portsmouth
- Insurance Farm, Portsmouth
- Insurance Services, Portsmouth
- Internal Medicine Doctors, Portsmouth - Internists Physicians & Surgeons
- Internet Providers, Portsmouth
- Internet Services, Portsmouth
- Investment Management Services, Portsmouth
- Investment Services & Advisors, Portsmouth
- Investments & Mutual Funds, Portsmouth
- Italian Restaurants, Portsmouth
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