- Ice Cream & Frozen Yogurt, Madison
- Ice Houses, Madison
- Industrial & Commercial Cleaning Services & Companies, Madison
- Industrial & Commercial Real Estate, Madison
- Industrial & Heavy Equipment Repair & Service, Madison
- Industrial Contractors, Madison
- Industrial Developers, Madison
- Industrial Equipment & Machinery, Madison
- Industrial Generators, Madison
- Industrial Goods & Products - Hard Goods - Large, Madison
- Industrial Goods & Products - Hard Goods - Small, Madison
- Industrial Goods & Products - Soft - Large & Small, Madison
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Madison
- Industrial Supply, Parts & Equipment - Miscellaneous, Madison
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- Industry, Madison
- Information Bureaus & Services, Madison
- Insurance Accident, Madison
- Insurance Carriers, Madison
- Insurance Farm, Madison
- Insurance Motorcycles, Madison
- Interdenominational Church, Madison
- Internal Medicine Doctors, Madison - Internists Physicians & Surgeons
- International Trade Consultants, Madison - Foreign Trade
- Internet Services, Madison
- Investment Bankers, Madison
- Investment Services & Advisors, Madison
- Iron, Steel & Metal Fabricators, Madison - Fabrication Companies
- Italian Restaurants, Madison
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