- Ready Mix Concrete, Mount Sinai - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Mount Sinai
- Real Estate, Mount Sinai - Agent, Broker & Companies
- Real Estate Management, Mount Sinai
- Real Estate Services, Mount Sinai
- Recreational Organizations, Mount Sinai
- Recycling Scrap & Waste Materials, Mount Sinai - Scrap Metal, etc
- Refuse Collection & Disposal, Mount Sinai
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- Refuse Systems & Garbage Disposal, Mount Sinai
- Religious Organizations, Mount Sinai
- Repair Services, Mount Sinai
- Residential Construction Contractors, Mount Sinai - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Mount Sinai
- Restaurants/Food & Dining, Mount Sinai
- Roofing Consultants, Mount Sinai - Roofing Companies
- Roofing Contractors, Mount Sinai - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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