- Ice Cream & Frozen Dessert Storage & Equipment, Marathon
- Industrial & Commercial Cleaning Services & Companies, Marathon
- Industrial & Commercial Real Estate, Marathon
- Industrial & Heavy Vehicle Dealers, Marathon
- Industrial Contractors, Marathon
- Industrial Equipment & Machinery, Marathon
- Industrial Goods & Products - Hard Goods - Large, Marathon
- Industrial Goods & Products - Hard Goods - Small, Marathon
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Marathon
- Industrial Supply, Parts & Equipment - Miscellaneous, Marathon
- Industrial Waterway & Dock Construction, Marathon
- Industry, Marathon
- Information Bureaus & Services, Marathon
- Information Retrieval Services, Marathon
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- Inspection & Testing Services, Marathon
- Insurance Brokers, Marathon
- Insurance Carriers, Marathon
- Insurance Services, Marathon
- Interior Designers, Marathon
- Interior Designers & Decorators, Marathon
- Interior Designers Professional, Marathon
- Internal Medicine Doctors, Marathon - Internists Physicians & Surgeons
- International Restaurants, Marathon
- Internet Services, Marathon
- Investment Management Services, Marathon
- Investment Services & Advisors, Marathon
- Italian Restaurants, Marathon
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