- Ice Cream & Frozen Yogurt, Gurnee
- Ice Cream Mixes & Other Frozen Mixes, Gurnee
- Indian Restaurants, Gurnee
- Industrial & Commercial Cleaning Services & Companies, Gurnee
- Industrial & Commercial Real Estate, Gurnee
- Industrial & Personal Service Paper, Boxes & Cardboard, Gurnee
- Industrial Contractors, Gurnee
- Industrial Developers, Gurnee
- Industrial Equipment & Machinery, Gurnee
- Industrial Equipment & Systems, Gurnee
- Industrial Goods & Products - Hard Goods - Large, Gurnee
- Industrial Goods & Products - Hard Goods - Small, Gurnee
- Industrial Goods & Products - Soft - Large & Small, Gurnee
- Industrial Heaters & Boilers, Gurnee
- Industrial Lifts, Gurnee
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Gurnee
- Industrial Pumps, Gurnee - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Gurnee
- Industrial Waterway & Dock Construction, Gurnee
- Industry, Gurnee
- Infectious Disease Specialists, Gurnee - Doctors, Physicians & Surgeons
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- Information Bureaus & Services, Gurnee
- Inks, Gurnee
- Inks - Manufacturing, Gurnee
- Insurance Carriers, Gurnee
- Insurance Consulting & Information Services, Gurnee
- Insurance Farm, Gurnee
- Insurance General Liability, Gurnee
- Insurance Motorcycles, Gurnee
- Insurance Renters, Gurnee
- Insurance Services, Gurnee
- Intel Computers, Gurnee
- Interactive & Multimedia Software, Gurnee
- Interior Designers, Gurnee
- Interior Designers & Decorators, Gurnee
- Internal Medicine Doctors, Gurnee - Internists Physicians & Surgeons
- Internet Services, Gurnee
- Inventory Management Services, Gurnee - Inventory Service
- Investment Management Services, Gurnee
- Investment Services & Advisors, Gurnee
- Iron, Steel & Metal Fabricators, Gurnee - Fabrication Companies
- Italian Restaurants, Gurnee
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