- Radiator Coolant & Solvents, Sayville - Engine Coolant
- Radio & Tv Communications Equipment Manufacturers, Sayville
- Real Estate, Sayville - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Sayville
- Real Estate Appraiser, Sayville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Sayville
- Real Estate Broker, Sayville
- Real Estate Services, Sayville
- Recording Studio - Equipment & Rental, Sayville
- Reducing Exercise & Weight Control Services, Sayville
- Reformed Churches, Sayville
- Refrigerator Sales, Service & Repair, Sayville - Fridge
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- Refuse Collection & Disposal Services, Sayville
- Religious Organizations, Sayville
- Repair Services, Sayville
- Residential, Sayville
- Residential Apartments, Sayville
- Residential Care Facilities, Sayville
- Resorts & Hotels, Sayville
- Restaurants/Food & Dining, Sayville
- Retreat Facilities & Houses, Sayville
- Roofing Consultants, Sayville - Roofing Companies
- Roofing Contractors, Sayville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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