- Ice Sports Clubs & Instruction, Waupun
- Industrial & Farm Equipment, Waupun
- Industrial & Heavy Vehicle Dealers, Waupun
- Industrial Contractors, Waupun
- Industrial Equipment & Machinery, Waupun
- Industrial Equipment & Systems, Waupun
- Industrial Goods & Products - Hard Goods - Small, Waupun
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Waupun
- Industrial Pumps, Waupun - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Trucks, Waupun
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- Industry, Waupun
- Inspection & Testing Services, Waupun
- Insurance Carriers, Waupun
- Insurance Farm, Waupun
- Internal Medicine Doctors, Waupun - Internists Physicians & Surgeons
- Investment Management Services, Waupun
- Investment Services & Advisors, Waupun
- Iron, Steel & Metal Fabricators, Waupun - Fabrication Companies
- Italian Restaurants, Waupun
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