- Independent Care Services, Sandusky
- Industrial & Commercial Cleaning Services & Companies, Sandusky
- Industrial & Heavy Vehicle Dealers, Sandusky
- Industrial Contractors, Sandusky
- Industrial Equipment & Machinery, Sandusky
- Industrial Goods & Products - Hard Goods - Large, Sandusky
- Industrial Goods & Products - Hard Goods - Small, Sandusky
- Industrial Supply, Parts & Equipment - Miscellaneous, Sandusky
- Industry, Sandusky
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- Information Bureaus & Services, Sandusky
- Inspection & Testing Services, Sandusky
- Insulation Contractors, Sandusky - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Sandusky
- International Community Of Christ Church, Sandusky
- Internet Providers, Sandusky
- Internet Services, Sandusky
- Investment Management Services, Sandusky
- Investment Services & Advisors, Sandusky
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