- Racing Car Supplies, Central Islip
- Radio & Television Repair Shops , Central Islip - TV Repair
- Radio & Tv Communications Equipment Manufacturers, Central Islip
- Radio Communications Equipment & Systems , Central Islip
- Real Estate, Central Islip - Agent, Broker & Companies
- Real Estate Appraisers & Consulting Services, Central Islip
- Real Estate Attorneys & Lawyers, Central Islip
- Real Estate Consultants, Central Islip
- Real Estate Lawyers & Attorneys, Central Islip
- Real Estate Services, Central Islip
- Recycling Drop-Off Centers, Central Islip
- Recycling Scrap & Waste Materials, Central Islip - Scrap Metal, etc
- Refreshment Stands, Central Islip
- Rehabilitation Centers, Products & Services, Central Islip
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- Rehabilitation Specialists, Central Islip
- Religious Organizations, Central Islip
- Repair Services, Central Islip
- Research Services, Central Islip
- Residential, Central Islip
- Residential Apartments, Central Islip
- Residential Care Facilities, Central Islip
- Residential Construction Contractors, Central Islip - General Contractors
- Resorts & Hotels, Central Islip
- Restaurant & Lounge, Bar, Or Pub, Central Islip
- Restaurants/Food & Dining, Central Islip
- Riding & Rodeo Services, Central Islip
- Roofing Consultants, Central Islip - Roofing Companies
- Roofing Contractors, Central Islip - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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