- Ice Cream & Frozen Yogurt, Champaign
- Identification Card Access Services, Champaign
- Image Consultants Personal, Champaign
- Immigration And Naturalization Attorneys & Lawyers, Champaign
- Immigration Attorneys & Lawyers, Champaign - Naturalization
- Immigration Lawyers & Attorneys, Champaign - Naturalization
- Imported Auto Parts, Champaign
- Importers, Champaign
- Independent Church, Champaign
- Indian Goods & Products Stores, Champaign
- Indian Restaurants, Champaign
- Individual & Family Information & Referral Services, Champaign
- Industrial & Commercial Cleaning Services & Companies, Champaign
- Industrial & Commercial Real Estate, Champaign
- Industrial & Heavy Equipment Repair & Service, Champaign
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Champaign
- Industrial & Personal Service Paper, Boxes & Cardboard, Champaign
- Industrial Contractors, Champaign
- Industrial Equipment & Machinery, Champaign
- Industrial Equipment & Machinery - Other, Champaign
- Industrial Filters, Champaign
- Industrial Goods & Products - Hard Goods - Large, Champaign
- Industrial Goods & Products - Hard Goods - Small, Champaign
- Industrial Goods & Products - Soft - Large & Small, Champaign
- Industrial Heaters & Boilers, Champaign
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Champaign
- Industrial Pumps, Champaign - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Champaign
- Industry, Champaign
- Information Bureaus & Services, Champaign
- Information Technology Services, Champaign - IT Service
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- Inspection & Testing Services, Champaign
- Insulation Contractors, Champaign - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Annuities, Champaign
- Insurance Brokers, Champaign
- Insurance Carriers, Champaign
- Insurance Carriers By Specialty, Champaign
- Insurance Consulting & Information Services, Champaign
- Insurance Farm, Champaign
- Insurance General Liability, Champaign
- Insurance Motorcycles, Champaign
- Insurance Real Property, Champaign
- Insurance Renters, Champaign
- Insurance Services, Champaign
- Insurance Underwriters, Champaign
- Intel Computers, Champaign
- Interactive & Multimedia Software, Champaign
- Interdenominational Church, Champaign
- Interior Designers, Champaign
- Interior Designers & Decorators, Champaign
- Internal Medicine Doctors, Champaign - Internists Physicians & Surgeons
- International Trade Consultants, Champaign - Foreign Trade
- Internet - Voice Application, Champaign
- Internet Providers, Champaign
- Internet Services, Champaign
- Internet Services Software & Design, Champaign
- Investment Bankers, Champaign
- Investment Management Services, Champaign
- Investment Services & Advisors, Champaign
- Iron, Steel & Metal Fabricators, Champaign - Fabrication Companies
- Irrigation Systems & Equipment, Champaign
- Italian Restaurants, Champaign
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