- Ice Cream & Frozen Yogurt, Kirksville
- Ice Wholesale, Kirksville - Dry Ice
- In Home Services, Kirksville
- Industrial & Commercial Cleaning Services & Companies, Kirksville
- Industrial & Commercial Real Estate, Kirksville
- Industrial & Heavy Equipment Repair & Service, Kirksville
- Industrial Contractors, Kirksville
- Industrial Goods & Products - Hard Goods - Large, Kirksville
- Industrial Goods & Products - Hard Goods - Small, Kirksville
- Industrial Goods & Products - Soft - Large & Small, Kirksville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Kirksville
- Industry, Kirksville
- Information Bureaus & Services, Kirksville
- Insurance Brokers, Kirksville
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- Insurance Carriers, Kirksville
- Insurance Consulting & Information Services, Kirksville
- Insurance Farm, Kirksville
- Insurance Services, Kirksville
- Interior Designers, Kirksville
- Interior Designers & Decorators, Kirksville
- Internet Providers, Kirksville
- Internet Services, Kirksville
- Investment Management Services, Kirksville
- Investment Services & Advisors, Kirksville
- Invitations & Envelopes, Kirksville
- Iron, Steel & Metal Fabricators, Kirksville - Fabrication Companies
- Italian Restaurants, Kirksville
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