- Ice Cream & Frozen Yogurt, Yankton
- Ice Wholesale, Yankton - Dry Ice
- Individual & Family Services, Yankton
- Industrial & Commercial Cleaning Services & Companies, Yankton
- Industrial & Heavy Equipment Repair & Service, Yankton
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Yankton
- Industrial Contractors, Yankton
- Industrial Engineers & Designers, Yankton - Architectural Designers
- Industrial Equipment & Machinery, Yankton
- Industrial Equipment & Machinery - Other, Yankton
- Industrial Goods & Products - Hard Goods - Large, Yankton
- Industrial Goods & Products - Hard Goods - Small, Yankton
- Industrial Goods & Products - Soft - Large & Small, Yankton
- Industrial Lifts, Yankton
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Yankton
- Industrial Pumps, Yankton - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Yankton
- Industry, Yankton
- Information Bureaus & Services, Yankton
- Information Technology Services, Yankton - IT Service
- Insulation Contractors, Yankton - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
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- Insurance Adjusters, Yankton
- Insurance Brokers, Yankton
- Insurance Carriers, Yankton
- Insurance Carriers By Specialty, Yankton
- Insurance Crop, Yankton
- Insurance Farm, Yankton
- Insurance Medicare, Yankton
- Insurance Services, Yankton
- Insurance Underwriters, Yankton
- Interior Designers, Yankton
- Interior Designers & Decorators, Yankton
- Internal Medicine Doctors, Yankton - Internists Physicians & Surgeons
- Internet Development, Yankton
- Internet Home Page Development & Consulting, Yankton
- Internet Providers, Yankton
- Internet Services, Yankton
- Investment Management Services, Yankton
- Investment Services & Advisors, Yankton
- Iron, Steel & Metal Fabricators, Yankton - Fabrication Companies
- Italian Restaurants, Yankton
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