- Radiator Coolant & Solvents, Rumford - Engine Coolant
- Radio Stations & Broadcasting Companies, Rumford
- Real Estate, Rumford - Agent, Broker & Companies
- Real Estate Appraiser, Rumford - Appraisal Services
- Real Estate Appraisers & Consulting Services, Rumford
- Real Estate Rentals, Rumford
- Real Estate Services, Rumford
- Refuse Systems & Garbage Disposal, Rumford
- Relief Organizations, Rumford
- Religious Organizations, Rumford
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- Rental & Leasing Business Equipment, Rumford
- Repair Services, Rumford
- Research & Development Bureaus, Rumford - Commercial, Economic, Sociological & Educational Research
- Research Services, Rumford
- Residential Care Facilities, Rumford
- Resorts & Hotels, Rumford
- Restaurants/Food & Dining, Rumford
- Roofing Consultants, Rumford - Roofing Companies
- Roofing Contractors, Rumford - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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