- Ice Cream & Frozen Desserts, Medford
- Ice Cream & Frozen Yogurt, Medford
- Industrial & Commercial Cleaning Services & Companies, Medford
- Industrial & Commercial Real Estate, Medford
- Industrial & Heavy Equipment Repair & Service, Medford
- Industrial & Personal Service Paper, Boxes & Cardboard, Medford
- Industrial Contractors, Medford
- Industrial Equipment & Machinery, Medford
- Industrial Goods & Products - Hard Goods - Large, Medford
- Industrial Goods & Products - Hard Goods - Small, Medford
- Industrial Goods & Products - Soft - Large & Small, Medford
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Medford
- Industrial Supply, Parts & Equipment - Miscellaneous, Medford
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- Industry, Medford
- Information Retrieval Services, Medford
- Inspection & Testing Services, Medford
- Insurance Carriers, Medford
- Insurance Consulting & Information Services, Medford
- Insurance Farm, Medford
- Insurance General Liability, Medford
- Insurance Motorcycles, Medford
- Insurance Renters, Medford
- Insurance Services, Medford
- Internal Medicine Doctors, Medford - Internists Physicians & Surgeons
- Investment Services & Advisors, Medford
- Italian Restaurants, Medford
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