- Racks Industrial, Rumford
- Radio Stations & Broadcasting Companies, Rumford
- Radiology Equipment & Services, Rumford - X-Ray Equipment & Supplies
- Real Estate, Rumford - Agent, Broker & Companies
- Real Estate Appraisers & Consulting Services, Rumford
- Real Estate Consultants, Rumford
- Real Estate Developers, Rumford
- Real Estate Management, Rumford
- Real Estate Services, Rumford
- Record Destruction Service, Rumford
- Record Storage, Destruction & Management, Rumford
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- Reducing Exercise & Weight Control Services, Rumford
- Rehabilitation Centers, Products & Services, Rumford
- Rehabilitation Specialists, Rumford
- Religious Organizations, Rumford
- Repair Services, Rumford
- Research Services, Rumford
- Residential, Rumford
- Residential Apartments, Rumford
- Restaurant Equipment Repair & Service, Rumford - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants/Food & Dining, Rumford
- Roller Skating Rinks, Rumford
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