- Ice Cream & Frozen Desserts, Schaumburg
- Ice Cream & Frozen Yogurt, Schaumburg
- Ice Cream Mixes & Other Frozen Mixes, Schaumburg
- Ice Wholesale, Schaumburg - Dry Ice
- Ikea Furniture, Schaumburg
- Image Consultants Personal, Schaumburg
- Imported Auto Parts, Schaumburg
- Importers, Schaumburg
- In Home Services, Schaumburg
- Independent Synagogues, Schaumburg
- Indian Goods & Products Stores, Schaumburg
- Indian Restaurants, Schaumburg
- Industrial & Commercial Cleaning Services & Companies, Schaumburg
- Industrial & Commercial Real Estate, Schaumburg
- Industrial & Heavy Equipment Repair & Service, Schaumburg
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Schaumburg
- Industrial & Personal Service Paper, Boxes & Cardboard, Schaumburg
- Industrial Contractors, Schaumburg
- Industrial Developers, Schaumburg
- Industrial Equipment & Machinery, Schaumburg
- Industrial Equipment & Machinery - Other, Schaumburg
- Industrial Equipment & Systems, Schaumburg
- Industrial Goods & Products - Hard Goods - Large, Schaumburg
- Industrial Goods & Products - Hard Goods - Small, Schaumburg
- Industrial Goods & Products - Soft - Large & Small, Schaumburg
- Industrial Lifts, Schaumburg
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Schaumburg
- Industrial Pump Repair & Service, Schaumburg - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Schaumburg - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Schaumburg
- Industry, Schaumburg
- Information Bureaus & Services, Schaumburg
- Information Processing & Retrieval Systems, Schaumburg
- Information Technology Services, Schaumburg - IT Service
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- Inspection & Testing Services, Schaumburg
- Instrument Manufacturers, Schaumburg
- Instrument Process Industrial Equipment & Supplies, Schaumburg
- Insulation Contractors, Schaumburg - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Schaumburg
- Insurance Brokers, Schaumburg
- Insurance Carriers, Schaumburg
- Insurance Carriers By Specialty, Schaumburg
- Insurance Claim Processing Services, Schaumburg
- Insurance Consulting & Information Services, Schaumburg
- Insurance Farm, Schaumburg
- Insurance General Liability, Schaumburg
- Insurance Motorcycles, Schaumburg
- Insurance Recreational, Schaumburg
- Insurance Renters, Schaumburg
- Insurance Risk Management & Loss Control, Schaumburg
- Insurance Services, Schaumburg
- Interior Designers, Schaumburg
- Interior Designers & Decorators, Schaumburg
- Interior Designers Professional, Schaumburg
- Internal Medicine Doctors, Schaumburg - Internists Physicians & Surgeons
- International Insurance, Schaumburg
- International Trade Consultants, Schaumburg - Foreign Trade
- Internet Marketing & Advertising Services, Schaumburg
- Internet Providers, Schaumburg
- Internet Services, Schaumburg
- Internet Services Software & Design, Schaumburg
- Investment Bankers, Schaumburg
- Investment Management Services, Schaumburg
- Investment Services & Advisors, Schaumburg
- Investments & Mutual Funds, Schaumburg
- Iron, Steel & Metal Fabricators, Schaumburg - Fabrication Companies
- Italian Restaurants, Schaumburg
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