- Industrial & Commercial Real Estate, Elgin
- Industrial & Heavy Equipment Repair & Service, Elgin
- Industrial Contractors, Elgin
- Industrial Goods & Products - Hard Goods - Large, Elgin
- Industrial Goods & Products - Hard Goods - Small, Elgin
- Industrial Pump Repair & Service, Elgin - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industry, Elgin
- Information Bureaus & Services, Elgin
- Inspection & Testing Services, Elgin
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- Insulation Contractors, Elgin - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Elgin
- Insurance General Liability, Elgin
- Insurance Motorcycles, Elgin
- Insurance Renters, Elgin
- Interdenominational Church, Elgin
- Internal Medicine Doctors, Elgin - Internists Physicians & Surgeons
- Internet Services, Elgin
- Italian Restaurants, Elgin
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