- Ice Cream & Frozen Yogurt, Simsbury
- Indian Restaurants, Simsbury
- Industrial & Commercial Cleaning Services & Companies, Simsbury
- Industrial & Commercial Real Estate, Simsbury
- Industrial & Heavy Equipment Repair & Service, Simsbury
- Industrial & Heavy Vehicle Dealers, Simsbury
- Industrial Contractors, Simsbury
- Industrial Engineers & Designers, Simsbury - Architectural Designers
- Industrial Equipment & Machinery, Simsbury
- Industrial Goods & Products - Soft - Large & Small, Simsbury
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Simsbury
- Industrial Pump Repair & Service, Simsbury - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Simsbury - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industry, Simsbury
- Information Bureaus & Services, Simsbury
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- Information Technology Services, Simsbury - IT Service
- Insurance Carriers, Simsbury
- Insurance Farm, Simsbury
- Insurance General Liability, Simsbury
- Insurance Motorcycles, Simsbury
- Insurance Renters, Simsbury
- Insurance Services, Simsbury
- Interior Designers, Simsbury
- Interior Designers & Decorators, Simsbury
- International Trade Consultants, Simsbury - Foreign Trade
- Investment Management Services, Simsbury
- Investment Services & Advisors, Simsbury
- Irish Restaurants, Simsbury
- Iron, Steel & Metal Fabricators, Simsbury - Fabrication Companies
- Italian Restaurants, Simsbury
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