- Ice Cream & Frozen Yogurt, Palatine
- Ice Sports Clubs & Instruction, Palatine
- Imported Auto Parts, Palatine
- Importers, Palatine
- Indian Restaurants, Palatine
- Individual & Family Information & Referral Services, Palatine
- Industrial & Commercial Cleaning Services & Companies, Palatine
- Industrial & Commercial Real Estate, Palatine
- Industrial & Heavy Equipment Repair & Service, Palatine
- Industrial & Personal Service Paper, Boxes & Cardboard, Palatine
- Industrial Chemicals & Adhesives, Palatine
- Industrial Contractors, Palatine
- Industrial Equipment & Machinery, Palatine
- Industrial Equipment & Systems, Palatine
- Industrial Filters, Palatine
- Industrial Goods & Products - Hard Goods - Large, Palatine
- Industrial Goods & Products - Hard Goods - Small, Palatine
- Industrial Goods & Products - Soft - Large & Small, Palatine
- Industrial Heaters & Boilers, Palatine
- Industrial Lifts, Palatine
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Palatine
- Industrial Maintenance & Cleaning Contractors, Palatine
- Industrial Pumps, Palatine - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Palatine
- Industry, Palatine
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- Information & Records Management Services, Palatine
- Information Bureaus & Services, Palatine
- Information Retrieval Services, Palatine
- Information Technology Services, Palatine - IT Service
- Inspection & Testing Services, Palatine
- Insurance Brokers, Palatine
- Insurance Carriers, Palatine
- Insurance Claim Processing Services, Palatine
- Insurance Consulting & Information Services, Palatine
- Insurance Dental, Palatine
- Insurance Farm, Palatine
- Insurance General Liability, Palatine
- Insurance Motorcycles, Palatine
- Insurance Renters, Palatine
- Insurance Services, Palatine
- Interior Designers, Palatine
- Interior Designers & Decorators, Palatine
- Internal Medicine Doctors, Palatine - Internists Physicians & Surgeons
- International Trade Consultants, Palatine - Foreign Trade
- Internet Providers, Palatine
- Internet Services, Palatine
- Investment Management Services, Palatine
- Investment Services & Advisors, Palatine
- Iron, Steel & Metal Fabricators, Palatine - Fabrication Companies
- Italian Restaurants, Palatine
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