- Ice Cream & Frozen Yogurt, Mattoon
- Individual & Family Information & Referral Services, Mattoon
- Industrial & Commercial Cleaning Services & Companies, Mattoon
- Industrial & Commercial Real Estate, Mattoon
- Industrial & Heavy Vehicle Dealers, Mattoon
- Industrial Contractors, Mattoon
- Industrial Equipment & Machinery, Mattoon
- Industrial Goods & Products - Hard Goods - Large, Mattoon
- Industrial Goods & Products - Hard Goods - Small, Mattoon
- Industrial Goods & Products - Soft - Large & Small, Mattoon
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Mattoon
- Industrial Pumps, Mattoon - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Mattoon
- Industrial Trucks, Mattoon
- Industry, Mattoon
- Information Bureaus & Services, Mattoon
- Inspection & Testing Services, Mattoon
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- Insulation & Energy Conservation Materials, Mattoon
- Insulation Contractors, Mattoon - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Mattoon
- Insurance Carriers, Mattoon
- Insurance Farm, Mattoon
- Insurance Major Medical, Mattoon
- Insurance Services, Mattoon
- Insurance Underwriters, Mattoon
- Interior Designers, Mattoon
- Interior Designers & Decorators, Mattoon
- Internal Medicine Doctors, Mattoon - Internists Physicians & Surgeons
- Internet Services, Mattoon
- Investment Bankers, Mattoon
- Investment Management Services, Mattoon
- Investment Services & Advisors, Mattoon
- Iron, Steel & Metal Fabricators, Mattoon - Fabrication Companies
- Italian Restaurants, Mattoon
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