- Radio Broadcasting Consultants, Cortlandt Manor
- Radiologists, Cortlandt Manor - Radiology Doctors, Physicians & Surgeons
- Ready Mix Concrete, Cortlandt Manor - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Cortlandt Manor
- Real Estate, Cortlandt Manor - Agent, Broker & Companies
- Real Estate Appraiser, Cortlandt Manor - Appraisal Services
- Real Estate Appraisers & Consulting Services, Cortlandt Manor
- Real Estate Developers, Cortlandt Manor
- Real Estate Services, Cortlandt Manor
- Records, Tapes, CDs - Used & Vintage, Cortlandt Manor
- Recreational Equipment & Supplies Companies, Cortlandt Manor
- Recycling Drop-Off Centers, Cortlandt Manor
- Recycling Scrap & Waste Materials, Cortlandt Manor - Scrap Metal, etc
- Rehabilitation Centers, Cortlandt Manor
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- Rehabilitation Centers, Products & Services, Cortlandt Manor
- Rehabilitation Specialists, Cortlandt Manor
- Religious Organizations, Cortlandt Manor
- Repair Services, Cortlandt Manor
- Research & Development Bureaus, Cortlandt Manor - Commercial, Economic, Sociological & Educational Research
- Research Film Laboratories & Film Services Motion Pictures, Cortlandt Manor
- Research Services, Cortlandt Manor
- Residential Care Facilities, Cortlandt Manor
- Residential Construction Contractors, Cortlandt Manor - General Contractors
- Restaurants/Food & Dining, Cortlandt Manor
- Retirement Communities & Home, Assisted Living & Apartments, Cortlandt Manor
- Riding & Rodeo Services, Cortlandt Manor
- Roofing Consultants, Cortlandt Manor - Roofing Companies
- Roofing Contractors, Cortlandt Manor - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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