- Ice Cream & Frozen Yogurt, Oscoda
- Industrial & Commercial Cleaning Services & Companies, Oscoda
- Industrial & Commercial Real Estate, Oscoda
- Industrial Contractors, Oscoda
- Industrial Equipment & Machinery, Oscoda
- Industrial Filters, Oscoda
- Industrial Generators, Oscoda
- Industrial Goods & Products - Hard Goods - Large, Oscoda
- Industrial Goods & Products - Hard Goods - Small, Oscoda
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Oscoda
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- Industrial Supply, Parts & Equipment - Miscellaneous, Oscoda
- Industry, Oscoda
- Information Bureaus & Services, Oscoda
- Insulation Contractors, Oscoda - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Oscoda
- Insurance Farm, Oscoda
- Internet Services, Oscoda
- Investment Management Services, Oscoda
- Investment Services & Advisors, Oscoda
- Irrigation Systems & Equipment, Oscoda
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