- Ice Cream & Frozen Yogurt, Naugatuck
- Ice Wholesale, Naugatuck - Dry Ice
- Immigration & Naturalization Services, Naugatuck
- Imprinting & Embossing Services, Naugatuck
- Industrial & Commercial Cleaning Services & Companies, Naugatuck
- Industrial & Commercial Real Estate, Naugatuck
- Industrial & Heavy Vehicle Dealers, Naugatuck
- Industrial Contractors, Naugatuck
- Industrial Equipment & Machinery, Naugatuck
- Industrial Generators, Naugatuck
- Industrial Goods & Products - Hard Goods - Small, Naugatuck
- Industrial Goods & Products - Soft - Large & Small, Naugatuck
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Naugatuck
- Industrial Supply, Parts & Equipment - Miscellaneous, Naugatuck
- Industry, Naugatuck
- Information Bureaus & Services, Naugatuck
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- Information Technology Services, Naugatuck - IT Service
- Inspection & Testing Services, Naugatuck
- Insulation Materials, Naugatuck - Foam, Cellulose, Fiberglass, Mineral Wool, Rockwool, etc
- Insurance Carriers, Naugatuck
- Insurance Carriers By Specialty, Naugatuck
- Insurance Farm, Naugatuck
- Insurance Flood, Naugatuck
- Insurance Services, Naugatuck
- Internal Medicine Doctors, Naugatuck - Internists Physicians & Surgeons
- International Affairs, Naugatuck
- Internet Marketing & Advertising Services, Naugatuck
- Internet Services, Naugatuck
- Investment Services & Advisors, Naugatuck
- Iron, Steel & Metal Fabricators, Naugatuck - Fabrication Companies
- Italian Restaurants, Naugatuck
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