- Radio & Tv Communications Equipment Manufacturers, Islip
- Real Estate, Islip - Agent, Broker & Companies
- Real Estate Services, Islip
- Record Storage, Destruction & Management, Islip
- Rehabilitation Centers, Products & Services, Islip
- Rehabilitation Specialists, Islip
- Religious Organizations, Islip
- Repair Services, Islip
- Residential, Islip
- Residential Apartments, Islip
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- Residential Real Estate Companies, Islip
- Resorts & Hotels, Islip
- Restaurant Management & Consulting, Islip - Food Facilities Consultants
- Restaurants/Food & Dining, Islip
- Retail Book Stores, Islip
- Road Construction, Islip - Companies & Contractors
- Road Construction & Repair Contractors, Islip
- Roofing Consultants, Islip - Roofing Companies
- Roofing Contractors, Islip - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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