- Ice Cream & Frozen Desserts, Medford
- Ice Cream & Frozen Yogurt, Medford
- Ice Sports Clubs & Instruction, Medford
- Ice Wholesale, Medford - Dry Ice
- Ignition Apparatus Manufacturers, Medford
- Immigration And Naturalization Attorneys & Lawyers, Medford
- Immigration Attorneys & Lawyers, Medford - Naturalization
- Immigration Lawyers & Attorneys, Medford - Naturalization
- Imported Auto Parts, Medford
- In Home Services, Medford
- Indian Restaurants, Medford
- Individual & Family Information & Referral Services, Medford
- Industrial & Commercial Cleaning Services & Companies, Medford
- Industrial & Commercial Concrete Contractors, Medford
- Industrial & Commercial Real Estate, Medford
- Industrial & Heavy Equipment Repair & Service, Medford
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Medford
- Industrial & Personal Service Paper, Boxes & Cardboard, Medford
- Industrial Contractors, Medford
- Industrial Developers, Medford
- Industrial Equipment & Machinery, Medford
- Industrial Equipment & Systems, 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 Pump Repair & Service, Medford - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Medford - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Medford
- Industrial Vehicle Equipment & Supplies, Medford
- Industry, Medford
- Information Bureaus & Services, Medford
- Information Retrieval Services, Medford
- Information Technology Services, Medford - IT Service
- Inks, Medford
- Inks - Manufacturing, Medford
- Inspection & Testing Services, Medford
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- Insulation & Energy Conservation Materials, Medford
- Insulation Contractors, Medford - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Medford
- Insurance Attorneys & Lawyers, Medford
- Insurance Attorneys & Lawyers, Medford
- Insurance Brokers, Medford
- Insurance Carriers, Medford
- Insurance Carriers By Specialty, Medford
- Insurance Compensation, Medford
- Insurance Consulting & Information Services, Medford
- Insurance Disability, Medford
- Insurance Farm, Medford
- Insurance General Liability, Medford
- Insurance Lawyers & Attorneys, Medford
- Insurance Major Medical, Medford
- Insurance Medical Examinations, Medford
- Insurance Medicare, Medford
- Insurance Motorcycles, Medford
- Insurance Real Property, Medford
- Insurance Renters, Medford
- Insurance Services, Medford
- Interdenominational Church, Medford
- Interior Designers, Medford
- Interior Designers & Decorators, Medford
- Internal Medicine Doctors, Medford - Internists Physicians & Surgeons
- Internet Development, Medford
- Internet Home Page Development & Consulting, Medford
- Internet Marketing & Advertising Services, Medford
- Internet Providers, Medford
- Internet Services, Medford
- Inventory Management Services, Medford - Inventory Service
- Investment Management Services, Medford
- Investment Services & Advisors, Medford
- Irish Restaurants, Medford
- Irrigation Systems & Equipment, Medford
- Italian Foods, Medford
- Italian Restaurants, Medford
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