- Radio & Television Repair Shops , Holtsville - TV Repair
- Radio & Tv Communications Equipment Manufacturers, Holtsville
- Radio Communications Equipment & Systems , Holtsville
- Real Estate, Holtsville - Agent, Broker & Companies
- Real Estate Appraiser, Holtsville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Holtsville
- Real Estate Management, Holtsville
- Real Estate Services, Holtsville
- Recreational Services, Holtsville
- Refrigeration & Cooling Equipment, Parts & Supplies , Holtsville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Holtsville - Ac, Freezer, Refrigerator Repair
- Rehabilitation Centers, Holtsville
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- Rehabilitation Specialists, Holtsville
- Religious Organizations, Holtsville
- Repair Services, Holtsville
- Research Services, Holtsville
- Residential, Holtsville
- Residential Apartments, Holtsville
- Residential Care Facilities, Holtsville
- Residential Construction Contractors, Holtsville - General Contractors
- Restaurants/Food & Dining, Holtsville
- Retail Book Stores, Holtsville
- Road Construction Equipment & Machinery, Holtsville
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