- Ice Cream & Frozen Yogurt, Edwardsville
- Indexing Service Book Periodical Etcetera, Edwardsville
- Indian Restaurants, Edwardsville
- Industrial & Commercial Cleaning Services & Companies, Edwardsville
- Industrial & Commercial Real Estate, Edwardsville
- Industrial & Personal Service Paper, Boxes & Cardboard, Edwardsville
- Industrial Contractors, Edwardsville
- Industrial Goods & Products - Hard Goods - Large, Edwardsville
- Industrial Goods & Products - Hard Goods - Small, Edwardsville
- Industrial Goods & Products - Soft - Large & Small, Edwardsville
- Industrial Heaters & Boilers, Edwardsville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Edwardsville
- Industrial Supply, Parts & Equipment - Miscellaneous, Edwardsville
- Industrial Waste Disposal, Edwardsville
- Industrial Waste Recycling, Edwardsville
- Industry, Edwardsville
- Information Bureaus & Services, Edwardsville
- Insurance Brokers, Edwardsville
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- Insurance Carriers, Edwardsville
- Insurance Consulting & Information Services, Edwardsville
- Insurance Farm, Edwardsville
- Insurance General Liability, Edwardsville
- Insurance Motorcycles, Edwardsville
- Insurance Renters, Edwardsville
- Insurance Services, Edwardsville
- Interdenominational Church, Edwardsville
- Interior Designers, Edwardsville
- Interior Designers & Decorators, Edwardsville
- Internal Medicine Doctors, Edwardsville - Internists Physicians & Surgeons
- Internet Entertainment, Edwardsville - Internet Services
- Internet Services, Edwardsville
- Internet Websites, Edwardsville - Web Hosting, etc
- Investment Management Services, Edwardsville
- Investment Services & Advisors, Edwardsville
- Italian Restaurants, Edwardsville
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