- Ignition Apparatus Manufacturers, Saint Johnsbury
- Independent Church, Saint Johnsbury
- Industrial & Commercial Cleaning Services & Companies, Saint Johnsbury
- Industrial & Commercial Real Estate, Saint Johnsbury
- Industrial & Personal Service Paper, Boxes & Cardboard, Saint Johnsbury
- Industrial Contractors, Saint Johnsbury
- Industrial Equipment & Machinery, Saint Johnsbury
- Industrial Goods & Products - Hard Goods - Large, Saint Johnsbury
- Industrial Goods & Products - Hard Goods - Small, Saint Johnsbury
- Industrial Goods & Products - Soft - Large & Small, Saint Johnsbury
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Saint Johnsbury
- Industrial Supply, Parts & Equipment - Miscellaneous, Saint Johnsbury
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- Industry, Saint Johnsbury
- Information Retrieval Services, Saint Johnsbury
- Insulation Contractors, Saint Johnsbury - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Saint Johnsbury
- Insurance Brokers, Saint Johnsbury
- Insurance Carriers, Saint Johnsbury
- Insurance Farm, Saint Johnsbury
- Insurance Services, Saint Johnsbury
- Internal Medicine Doctors, Saint Johnsbury - Internists Physicians & Surgeons
- Investment Management Services, Saint Johnsbury
- Investment Services & Advisors, Saint Johnsbury
- Italian Restaurants, Saint Johnsbury
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