- Ice Cream & Frozen Yogurt, Fort Atkinson
- Importers, Fort Atkinson
- Industrial & Commercial Cleaning Services & Companies, Fort Atkinson
- Industrial & Commercial Real Estate, Fort Atkinson
- Industrial & Heavy Equipment Repair & Service, Fort Atkinson
- Industrial Contractors, Fort Atkinson
- Industrial Goods & Products - Hard Goods - Large, Fort Atkinson
- Industrial Goods & Products - Hard Goods - Small, Fort Atkinson
- Industrial Heaters & Boilers, Fort Atkinson
- Industrial Lifts, Fort Atkinson
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Fort Atkinson
- Industrial Pump Repair & Service, Fort Atkinson - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Fort Atkinson
- Industry, Fort Atkinson
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- Inspection & Testing Services, Fort Atkinson
- Insulation Contractors, Fort Atkinson - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Fort Atkinson
- Insurance Carriers, Fort Atkinson
- Insurance Claim Processing Services, Fort Atkinson
- Insurance Farm, Fort Atkinson
- Insurance Services, Fort Atkinson
- Internet Services, Fort Atkinson
- Investment Bankers, Fort Atkinson
- Investment Management Services, Fort Atkinson
- Investment Services & Advisors, Fort Atkinson
- Investments & Mutual Funds, Fort Atkinson
- Iron, Steel & Metal Fabricators, Fort Atkinson - Fabrication Companies
- Italian Restaurants, Fort Atkinson
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