- Ice Cream & Frozen Yogurt, Rumford
- Industrial & Commercial Cleaning Services & Companies, Rumford
- Industrial Equipment & Machinery, Rumford
- Industrial Goods & Products - Hard Goods - Small, Rumford
- Industry, Rumford
- Inspection & Testing Services, Rumford
- Insurance Advisors, Rumford
- Insurance Carriers, Rumford
- Insurance Consulting & Information Services, Rumford
- Insurance Disability, Rumford
- Insurance General Liability, Rumford
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- Insurance Motorcycles, Rumford
- Insurance Renters, Rumford
- Insurance Services, Rumford
- Interior Designers, Rumford
- Interior Designers & Decorators, Rumford
- Interior Designers Professional, Rumford
- Internet Marketing & Advertising Services, Rumford
- Internet Services, Rumford
- Inventory Management Services, Rumford - Inventory Service
- Investment Services & Advisors, Rumford
- Italian Restaurants, Rumford
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