- Ice Cream & Frozen Yogurt, Allston
- Image Consultants Personal, Allston
- Importers, Allston
- Industrial & Commercial Cleaning Services & Companies, Allston
- Industrial & Commercial Real Estate, Allston
- Industrial Contractors, Allston
- Industrial Engineers & Designers, Allston - Architectural Designers
- Industrial Equipment & Machinery, Allston
- Industrial Goods & Products - Hard Goods - Small, Allston
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Allston
- Industry, Allston
- Information Bureaus & Services, Allston
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- Inspection & Testing Services, Allston
- Insurance Advisors, Allston
- Insurance Carriers, Allston
- Insurance Consulting & Information Services, Allston
- Insurance Services, Allston
- Interior Designers, Allston
- Interior Designers & Decorators, Allston
- Internet Services, Allston
- Investment Services & Advisors, Allston
- Islamic Church, Allston
- Italian Restaurants, Allston
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