- Ice Cream & Frozen Yogurt, Newtown
- Industrial & Commercial Cleaning Services & Companies, Newtown
- Industrial Contractors, Newtown
- Industrial Equipment & Machinery, Newtown
- Industrial Goods & Products - Hard Goods - Large, Newtown
- Industrial Goods & Products - Hard Goods - Small, Newtown
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Newtown
- Industrial Pumps, Newtown - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industry, Newtown
- Information Bureaus & Services, Newtown
- Information Technology Services, Newtown - IT Service
- Inspection & Testing Services, Newtown
- Insulation & Energy Conservation Materials, Newtown
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- Insulation Contractors, Newtown - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Newtown
- Insurance Carriers, Newtown
- Insurance Farm, Newtown
- Insurance Renters, Newtown
- Insurance Services, Newtown
- Interior Designers, Newtown
- Interior Designers & Decorators, Newtown
- Internet Services, Newtown
- Investment Services & Advisors, Newtown
- Investments & Mutual Funds, Newtown
- Iron, Steel & Metal Fabricators, Newtown - Fabrication Companies
- Italian Restaurants, Newtown
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