- Ice Cream & Frozen Yogurt, Montpelier
- Ice Skating Rinks, Montpelier
- Industrial & Commercial Cleaning Services & Companies, Montpelier
- Industrial & Commercial Real Estate, Montpelier
- Industrial & Heavy Equipment Repair & Service, Montpelier
- Industrial & Heavy Vehicle Dealers, Montpelier
- Industrial Contractors, Montpelier
- Industrial Engineers & Designers, Montpelier - Architectural Designers
- Industrial Equipment & Machinery, Montpelier
- Industrial Goods & Products - Hard Goods - Large, Montpelier
- Industrial Goods & Products - Hard Goods - Small, Montpelier
- Industrial Goods & Products - Soft - Large & Small, Montpelier
- Industrial Pump Repair & Service, Montpelier - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industry, Montpelier
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- Information Bureaus & Services, Montpelier
- Information Technology Services, Montpelier - IT Service
- Insurance Brokers, Montpelier
- Insurance Carriers, Montpelier
- Insurance Farm, Montpelier
- Insurance Major Medical, Montpelier
- Insurance Services, Montpelier
- Interior Designers, Montpelier
- Interior Designers & Decorators, Montpelier
- Internet Services, Montpelier
- Investment Management Services, Montpelier
- Investment Services & Advisors, Montpelier
- Irish Restaurants, Montpelier
- Italian Restaurants, Montpelier
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