- Radiator Coolant & Solvents, Melville - Engine Coolant
- Radio Communications Equipment & Systems , Melville
- Real Estate, Melville - Agent, Broker & Companies
- Real Estate Agencies, Melville
- Real Estate Developers, Melville
- Real Estate Services, Melville
- Recreational Organizations, Melville
- Recreational Services, Melville
- Recycling Drop-Off Centers, Melville
- Recycling Scrap & Waste Materials, Melville - Scrap Metal, etc
- Religious Education, Melville
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- Religious Organizations, Melville
- Religious Practitioners, Melville
- Repair Services, Melville
- Research & Development Bureaus, Melville - Commercial, Economic, Sociological & Educational Research
- Research Services, Melville
- Residential Care Facilities, Melville
- Restaurants/Food & Dining, Melville
- Rodeo & Equestrian Equipment & Supplies, Melville
- Roofing Consultants, Melville - Roofing Companies
- Roofing Contractors, Melville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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