- Industrial & Commercial Cleaning Services & Companies, South Boston
- Industrial & Commercial Real Estate, South Boston
- Industrial & Farm Equipment, South Boston
- Industrial & Heavy Equipment Repair & Service, South Boston
- Industrial Contractors, South Boston
- Industrial Goods & Products - Hard Goods - Large, South Boston
- Industrial Goods & Products - Hard Goods - Small, South Boston
- Industrial Goods & Products - Soft - Large & Small, South Boston
- Industrial Machinery Supplies & Equipment - Leasing & Rental, South Boston
- Industrial Supply, Parts & Equipment - Miscellaneous, South Boston
- Industry, South Boston
- Information Bureaus & Services, South Boston
- Information Technology Services, South Boston - IT Service
- Insulation Contractors, South Boston - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, South Boston
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- Insurance Carriers, South Boston
- Insurance Carriers By Specialty, South Boston
- Insurance Farm, South Boston
- Insurance Marine, South Boston
- Insurance Medicare, South Boston
- Insurance Motorcycles, South Boston
- Insurance Retirement Annuities & Pension, South Boston
- Insurance Services, South Boston
- Internal Medicine Doctors, South Boston - Internists Physicians & Surgeons
- Internet Services, South Boston
- Investment Management Services, South Boston
- Investment Services & Advisors, South Boston
- Iron, Steel & Metal Fabricators, South Boston - Fabrication Companies
- Italian Restaurants, South Boston
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