- Ice Cream & Frozen Yogurt, Platteville
- Ignition Apparatus Manufacturers, Platteville
- Individual & Family Information & Referral Services, Platteville
- Industrial & Commercial Cleaning Services & Companies, Platteville
- Industrial & Heavy Equipment Repair & Service, Platteville
- Industrial & Personal Service Paper, Boxes & Cardboard, Platteville
- Industrial Contractors, Platteville
- Industrial Developers, Platteville
- Industrial Equipment & Machinery, Platteville
- Industrial Generators, Platteville
- Industrial Goods & Products - Hard Goods - Large, Platteville
- Industrial Goods & Products - Hard Goods - Small, Platteville
- Industrial Goods & Products - Soft - Large & Small, Platteville
- Industrial Patterns, Platteville
- Industrial Pump Repair & Service, Platteville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Platteville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industry, Platteville
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- Information Bureaus & Services, Platteville
- Inspection & Testing Services, Platteville
- Insulation & Energy Conservation Materials, Platteville
- Insulation Contractors, Platteville - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Platteville
- Insurance Carriers, Platteville
- Insurance Farm, Platteville
- Insurance Services, Platteville
- Interior Designers, Platteville
- Interior Designers & Decorators, Platteville
- Internet Providers, Platteville
- Internet Services, Platteville
- Investment Management Services, Platteville
- Investment Services & Advisors, Platteville
- Iron Work Contractors, Platteville
- Italian Restaurants, Platteville
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