- Ice Cream & Frozen Yogurt, Dayton
- Individual & Family Information & Referral Services, Dayton
- Industrial & Commercial Cleaning Services & Companies, Dayton
- Industrial & Personal Service Paper, Boxes & Cardboard, Dayton
- Industrial Contractors, Dayton
- Industrial Filters, Dayton
- Industrial Goods & Products - Hard Goods - Large, Dayton
- Industrial Goods & Products - Hard Goods - Small, Dayton
- Industrial Goods & Products - Soft - Large & Small, Dayton
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Dayton
- Industry, Dayton
- Information Bureaus & Services, Dayton
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- Insurance Accident, Dayton
- Insurance Carriers, Dayton
- Insurance Farm, Dayton
- Insurance General Liability, Dayton
- Insurance Motorcycles, Dayton
- Internal Medicine Doctors, Dayton - Internists Physicians & Surgeons
- Internet Products - Hardware & Software Providers, Dayton
- Internet Providers, Dayton
- Internet Services, Dayton
- Investment Management Services, Dayton
- Investment Services & Advisors, Dayton
- Italian Restaurants, Dayton
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