- Ice Wholesale, Montoursville - Dry Ice
- Industrial & Commercial Cleaning Services & Companies, Montoursville
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Montoursville
- Industrial & Personal Service Paper, Boxes & Cardboard, Montoursville
- Industrial Contractors, Montoursville
- Industrial Equipment & Machinery, Montoursville
- Industrial Goods & Products - Hard Goods - Large, Montoursville
- Industrial Goods & Products - Hard Goods - Small, Montoursville
- Industrial Goods & Products - Soft - Large & Small, Montoursville
- Industrial Lifts, Montoursville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Montoursville
- Industrial Waste Recycling, Montoursville
- Industry, Montoursville
- Information Bureaus & Services, Montoursville
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- Information Retrieval Services, Montoursville
- Inks - Manufacturing, Montoursville
- Insecticides, Termite & Pest Control, Montoursville - Pesticides
- Inspection & Testing Services, Montoursville
- Insurance Carriers, Montoursville
- Insurance Consulting & Information Services, Montoursville
- Insurance Farm, Montoursville
- Insurance General Liability, Montoursville
- Insurance Motorcycles, Montoursville
- Insurance Renters, Montoursville
- Insurance Services, Montoursville
- Investment Management Services, Montoursville
- Investment Services & Advisors, Montoursville
- Italian Restaurants, Montoursville
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