- Ice Cream & Frozen Yogurt, Jerseyville
- Ice Wholesale, Jerseyville - Dry Ice
- Industrial & Commercial Cleaning Services & Companies, Jerseyville
- Industrial & Commercial Real Estate, Jerseyville
- Industrial & Heavy Equipment Repair & Service, Jerseyville
- Industrial & Heavy Vehicle Dealers, Jerseyville
- Industrial Contractors, Jerseyville
- Industrial Goods & Products - Hard Goods - Large, Jerseyville
- Industrial Goods & Products - Hard Goods - Small, Jerseyville
- Industrial Goods & Products - Soft - Large & Small, Jerseyville
- Industrial Lifts, Jerseyville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Jerseyville
- Industrial Supply, Parts & Equipment - Miscellaneous, Jerseyville
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- Industrial Trucks, Jerseyville
- Industry, Jerseyville
- Inspection & Testing Services, Jerseyville
- Insulation Material , Jerseyville - Contractors Supplies & Equipment
- Insurance Carriers, Jerseyville
- Insurance Farm, Jerseyville
- Interdenominational Church, Jerseyville
- Internal Medicine Doctors, Jerseyville - Internists Physicians & Surgeons
- Internet Providers, Jerseyville
- Internet Services, Jerseyville
- Investment Management Services, Jerseyville
- Investment Services & Advisors, Jerseyville
- Italian Restaurants, Jerseyville
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