- Ice Cream & Frozen Desserts, South Holland
- Imported Auto Parts, South Holland
- Industrial & Commercial Cleaning Services & Companies, South Holland
- Industrial & Commercial Real Estate, South Holland
- Industrial & Heavy Equipment Repair & Service, South Holland
- Industrial & Heavy Equipment Vehicle Rental & Leasing, South Holland
- Industrial & Heavy Vehicle Dealers, South Holland
- Industrial Contractors, South Holland
- Industrial Equipment & Machinery, South Holland
- Industrial Equipment & Machinery - Other, South Holland
- Industrial Goods & Products - Hard Goods - Large, South Holland
- Industrial Goods & Products - Hard Goods - Small, South Holland
- Industrial Goods & Products - Soft - Large & Small, South Holland
- Industrial Machinery Supplies & Equipment - Leasing & Rental, South Holland
- Industrial Patterns, South Holland
- Industrial Supply, Parts & Equipment - Miscellaneous, South Holland
- Industrial Trucks, South Holland
- Industrial Vehicle Equipment & Supplies, South Holland
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- Industrial Vehicle Repair, South Holland
- Industry, South Holland
- Information Bureaus & Services, South Holland
- Inspection & Testing Services, South Holland
- Instruments & Control Equipment, South Holland
- Insulation Contractors, South Holland - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, South Holland
- Insurance Farm, South Holland
- Insurance General Liability, South Holland
- Insurance Motorcycles, South Holland
- Insurance Renters, South Holland
- Interior Designers, South Holland
- Interior Designers & Decorators, South Holland
- Internal Medicine Doctors, South Holland - Internists Physicians & Surgeons
- Internet Services, South Holland
- Investment Services & Advisors, South Holland
- Iron, Steel & Metal Fabricators, South Holland - Fabrication Companies
- Italian Restaurants, South Holland
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