- Ice Cream & Frozen Yogurt, Madison
- Indian Restaurants, Madison
- Individual & Family Information & Referral Services, Madison
- Industrial & Commercial Cleaning Services & Companies, Madison
- Industrial & Commercial Real Estate, Madison
- Industrial & Heavy Vehicle Dealers, Madison
- Industrial Contractors, Madison
- Industrial Developers, Madison
- Industrial Equipment & Machinery, Madison
- Industrial Goods & Products - Hard Goods - Large, Madison
- Industrial Goods & Products - Hard Goods - Small, Madison
- Industrial Goods & Products - Soft - Large & Small, Madison
- Industrial Machinery Manufacturers, Madison
- Industrial Supply, Parts & Equipment - Miscellaneous, Madison
- Industrial Trucks, Madison
- Industrial Waste Disposal, Madison
- Industrial Waste Recycling, Madison
- Industry, Madison
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- Information Bureaus & Services, Madison
- Insecticides, Termite & Pest Control, Madison - Pesticides
- Insulation Contractors, Madison - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Madison
- Insurance Carriers, Madison
- Insurance Consulting & Information Services, Madison
- Insurance Farm, Madison
- Insurance Services, Madison
- Internal Medicine Doctors, Madison - Internists Physicians & Surgeons
- Internet Development, Madison
- Internet Home Page Development & Consulting, Madison
- Internet Providers, Madison
- Internet Services, Madison
- Investment Management Services, Madison
- Investment Services & Advisors, Madison
- Iron, Steel & Metal Fabricators, Madison - Fabrication Companies
- Italian Restaurants, Madison
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