- Ice Cream & Frozen Yogurt, Rockford
- Importers, Rockford
- In Home Services, Rockford
- Industrial & Commercial Cleaning Services & Companies, Rockford
- Industrial & Heavy Equipment Repair & Service, Rockford
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Rockford
- Industrial & Heavy Vehicle Dealers, Rockford
- Industrial Contractors, Rockford
- Industrial Equipment & Machinery, Rockford
- Industrial Equipment & Machinery - Other, Rockford
- Industrial Equipment & Supplies Jigs & Fixtures, Rockford
- Industrial Equipment & Systems, Rockford
- Industrial Goods & Products - Hard Goods - Large, Rockford
- Industrial Goods & Products - Hard Goods - Small, Rockford
- Industrial Goods & Products - Soft - Large & Small, Rockford
- Industrial Heaters & Boilers, Rockford
- Industrial Lifts, Rockford
- Industrial Machinery Manufacturers, Rockford
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Rockford
- Industrial Pump Repair & Service, Rockford - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Rockford - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
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- Industrial Waterway & Dock Construction, Rockford
- Industry, Rockford
- Insecticides, Termite & Pest Control, Rockford - Pesticides
- Inspection & Testing Services, Rockford
- Insurance Carriers, Rockford
- Insurance Carriers By Specialty, Rockford
- Insurance Farm, Rockford
- Insurance General Liability, Rockford
- Insurance Motorcycles, Rockford
- Insurance Real Property, Rockford
- Insurance Renters, Rockford
- Interior Designers & Decorators, Rockford
- Internet Services, Rockford
- Investment Bankers, Rockford
- Investment Management Services, Rockford
- Investment Services & Advisors, Rockford
- Iron, Steel & Metal Fabricators, Rockford - Fabrication Companies
- Irrigation Systems & Equipment, Rockford
- Irrigation Systems Repair & Service, Rockford
- Italian Restaurants, Rockford
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