- Ice Cream & Frozen Yogurt, Upper Sandusky
- Industrial & Heavy Vehicle Dealers, Upper Sandusky
- Industrial Contractors, Upper Sandusky
- Industrial Goods & Products - Hard Goods - Large, Upper Sandusky
- Industrial Goods & Products - Hard Goods - Small, Upper Sandusky
- Industrial Goods & Products - Soft - Large & Small, Upper Sandusky
- Industrial Heaters & Boilers, Upper Sandusky
- Industrial Machinery Manufacturers, Upper Sandusky
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Upper Sandusky
- Industrial Supply, Parts & Equipment - Miscellaneous, Upper Sandusky
- Industrial Trucks, Upper Sandusky
- Industrial Waterway & Dock Construction, Upper Sandusky
- Industry, Upper Sandusky
- Information Bureaus & Services, Upper Sandusky
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- Insurance Carriers, Upper Sandusky
- Insurance Carriers By Specialty, Upper Sandusky
- Insurance Consulting & Information Services, Upper Sandusky
- Insurance Farm, Upper Sandusky
- Insurance Flood, Upper Sandusky
- Insurance General Liability, Upper Sandusky
- Insurance Motorcycles, Upper Sandusky
- Insurance Renters, Upper Sandusky
- Insurance Services, Upper Sandusky
- Internet Providers, Upper Sandusky
- Internet Services, Upper Sandusky
- Investment Management Services, Upper Sandusky
- Investment Services & Advisors, Upper Sandusky
- Italian Restaurants, Upper Sandusky
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