- Ice Cream & Frozen Yogurt, Beacon
- Industrial & Commercial Cleaning Services & Companies, Beacon
- Industrial & Commercial Real Estate, Beacon
- Industrial Engineers & Designers, Beacon - Architectural Designers
- Industrial Equipment & Machinery, Beacon
- Industrial Goods & Products - Hard Goods - Small, Beacon
- Industrial Supply, Parts & Equipment - Miscellaneous, Beacon
- Industry, Beacon
- Information Bureaus & Services, Beacon
- Institutional Libraries, Beacon
- Insurance Carriers, Beacon
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- Insurance Farm, Beacon
- Insurance General Liability, Beacon
- Insurance Motorcycles, Beacon
- Insurance Renters, Beacon
- Interior Designers, Beacon
- Interior Designers & Decorators, Beacon
- Internal Medicine Doctors, Beacon - Internists Physicians & Surgeons
- Investment Services & Advisors, Beacon
- Irrigation Systems & Equipment, Beacon
- Italian Restaurants, Beacon
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