- Ice Cream & Frozen Yogurt, Madison
- Identification Equipment, Madison
- Indian Goods & Products Stores, Madison
- Indian Restaurants, Madison
- Industrial & Commercial Cleaning Services & Companies, Madison
- Industrial & Commercial Real Estate, Madison
- Industrial & Heavy Equipment Repair & Service, Madison
- Industrial Contractors, Madison
- Industrial Goods & Products - Hard Goods - Large, Madison
- Industrial Goods & Products - Hard Goods - Small, Madison
- Industrial Goods & Products - Soft - Large & Small, Madison
- Industry, Madison
- Inspection & Testing Services, Madison
- Insurance Adjusters, Madison
- Insurance Brokers, Madison
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- Insurance Carriers, Madison
- Insurance Farm, Madison
- Insurance General Liability, Madison
- Insurance Motorcycles, Madison
- Insurance Renters, Madison
- Insurance Services, Madison
- Interior Designers, Madison
- Interior Designers & Decorators, Madison
- Internal Medicine Doctors, Madison - Internists Physicians & Surgeons
- Internet Services, Madison
- Investment Management Services, Madison
- Investment Services & Advisors, Madison
- Iron Work Contractors, Madison
- Italian Restaurants, Madison
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