- Ice Cream & Frozen Desserts, Southborough
- Ice Cream & Frozen Yogurt, Southborough
- Industrial & Commercial Cleaning Services & Companies, Southborough
- Industrial & Commercial Real Estate, Southborough
- Industrial Buildings & Warehouses Contractors, Southborough
- Industrial Filters, Southborough
- Industrial Goods & Products - Hard Goods - Large, Southborough
- Industrial Goods & Products - Hard Goods - Small, Southborough
- Industrial Lifts, Southborough
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Southborough
- Industrial Supply, Parts & Equipment - Miscellaneous, Southborough
- Industrial Waste Disposal, Southborough
- Industrial Waste Recycling, Southborough
- Industry, Southborough
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- Insurance Adjusters, Southborough
- Insurance Carriers, Southborough
- Insurance Farm, Southborough
- Insurance Services, Southborough
- Interdenominational Church, Southborough
- Interior Designers, Southborough
- Interior Designers & Decorators, Southborough
- Interior Landscaping, Southborough
- International Trade Consultants, Southborough - Foreign Trade
- Internet Services, Southborough
- Investment Services & Advisors, Southborough
- Investments & Mutual Funds, Southborough
- Invitations & Announcements, Southborough - Baby Announcements, Wedding Invitations, Etc
- Italian Restaurants, Southborough
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