- Ice Cream & Frozen Desserts, Medford
- Ice Cream & Frozen Yogurt, Medford
- Ice Skating Rinks, Medford
- Immigration And Naturalization Attorneys & Lawyers, Medford
- Immigration Attorneys & Lawyers, Medford - Naturalization
- Immigration Lawyers & Attorneys, Medford - Naturalization
- Indian Restaurants, Medford
- Industrial & Commercial Cleaning Services & Companies, Medford
- Industrial & Commercial Real Estate, Medford
- Industrial & Heavy Equipment Repair & Service, 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 Hygiene Consultants, Medford
- Industrial Lifts, Medford
- Industrial Supply, Parts & Equipment - Miscellaneous, Medford
- Industrial Waterway & Dock Construction, Medford
- Industry, Medford
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- Information Bureaus & Services, Medford
- Inspection & Testing Services, Medford
- Insulation Contractors, Medford - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Advisors, Medford
- Insurance Brokers, Medford
- Insurance Carriers, Medford
- Insurance Consulting & Information Services, Medford
- Insurance Motorcycles, Medford
- Insurance Services, Medford
- Interior Designers, Medford
- Interior Designers & Decorators, Medford
- Interior Designers Professional, Medford
- Internal Medicine Doctors, Medford - Internists Physicians & Surgeons
- Internet & Online Directories, Medford
- Internet Providers, Medford
- Internet Services, Medford
- Inventory Management Services, Medford - Inventory Service
- Investment Services & Advisors, Medford
- Italian Restaurants, Medford
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