- Ice Cream & Frozen Yogurt, Billerica
- Identification Equipment, Billerica
- Importers, Billerica
- Indian Restaurants, Billerica
- Industrial & Commercial Cleaning Services & Companies, Billerica
- Industrial & Commercial Real Estate, Billerica
- Industrial & Heavy Vehicle Dealers, Billerica
- Industrial Contractors, Billerica
- Industrial Equipment & Machinery, Billerica
- Industrial Goods & Products - Hard Goods - Large, Billerica
- Industrial Goods & Products - Hard Goods - Small, Billerica
- Industrial Goods & Products - Soft - Large & Small, Billerica
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Billerica
- Industrial Supply, Parts & Equipment - Miscellaneous, Billerica
- Industrial Trucks, Billerica
- Industrial Waterway & Dock Construction, Billerica
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- Industry, Billerica
- Information Retrieval Services, Billerica
- Inks - Manufacturing, Billerica
- Inspection & Testing Services, Billerica
- Instrument Cases, Billerica
- Insurance Adjusters, Billerica
- Insurance Adjusters Public, Billerica
- Insurance Carriers, Billerica
- Insurance Services, Billerica
- Internet Providers, Billerica
- Internet Services, Billerica
- Investment Services & Advisors, Billerica
- Invitations & Announcements, Billerica - Baby Announcements, Wedding Invitations, Etc
- Irrigation Systems & Equipment, Billerica
- Italian Restaurants, Billerica
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