- Ice Cream & Frozen Yogurt, Clarkston
- Ice Wholesale, Clarkston - Dry Ice
- Industrial & Commercial Cleaning Services & Companies, Clarkston
- Industrial & Commercial Real Estate, Clarkston
- Industrial & Heavy Equipment Repair & Service, Clarkston
- Industrial Contractors, Clarkston
- Industrial Equipment & Machinery, Clarkston
- Industrial Goods & Products - Hard Goods - Large, Clarkston
- Industrial Goods & Products - Hard Goods - Small, Clarkston
- Industrial Goods & Products - Soft - Large & Small, Clarkston
- Industrial Lifts, Clarkston
- Industrial Pump Repair & Service, Clarkston - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Clarkston
- Industry, Clarkston
- Infant & Baby Furniture & Equipment Stores, Clarkston
- Information Bureaus, Clarkston
- Information Bureaus & Services, Clarkston
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- Information Retrieval Services, Clarkston
- Inks, Clarkston
- Inks - Manufacturing, Clarkston
- Insulation Contractors, Clarkston - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Clarkston
- Insurance Consulting & Information Services, Clarkston
- Insurance Farm, Clarkston
- Insurance Services, Clarkston
- Interdenominational Church, Clarkston
- Interior Designers, Clarkston
- Interior Designers & Decorators, Clarkston
- Internal Medicine Doctors, Clarkston - Internists Physicians & Surgeons
- International Community Of Christ Church, Clarkston
- Investment Management Services, Clarkston
- Investment Services & Advisors, Clarkston
- Iron, Steel & Metal Fabricators, Clarkston - Fabrication Companies
- Italian Restaurants, Clarkston
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