- Race Car Dealers, Ronkonkoma
- Racing Car Supplies, Ronkonkoma
- Racing Including Track Operations, Ronkonkoma
- Racks Industrial, Ronkonkoma
- Radio & Tv Communications Equipment Manufacturers, Ronkonkoma
- Radio Shack/Tandy Computers, Ronkonkoma
- Radio Stations & Broadcasting Companies, Ronkonkoma
- Radiology Equipment & Services, Ronkonkoma - X-Ray Equipment & Supplies
- Radiotelephone Communications, Ronkonkoma
- Range & Oven Repair, Service & Sales, Ronkonkoma
- Reading Instruction Schools, Ronkonkoma
- Ready Mix Concrete, Ronkonkoma - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Ronkonkoma
- Real Estate, Ronkonkoma - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Ronkonkoma
- Real Estate Appraiser, Ronkonkoma - Appraisal Services
- Real Estate Appraisers & Consulting Services, Ronkonkoma
- Real Estate Consultants, Ronkonkoma
- Real Estate Developers, Ronkonkoma
- Real Estate Management, Ronkonkoma
- Real Estate Services, Ronkonkoma
- Record Destruction Service, Ronkonkoma
- Record Storage, Destruction & Management, Ronkonkoma
- Recording Studio - Equipment & Rental, Ronkonkoma
- Recreational Equipment & Supplies Companies, Ronkonkoma
- Recreational Organizations, Ronkonkoma
- Recreational Services, Ronkonkoma
- Recycling Drop-Off Centers, Ronkonkoma
- Recycling Scrap & Waste Materials, Ronkonkoma - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Ronkonkoma
- Reflexologists, Ronkonkoma
- Refrigeration & Cooling Equipment, Parts & Supplies , Ronkonkoma - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Ronkonkoma - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Ronkonkoma
- Refrigerator Sales, Service & Repair, Ronkonkoma - Fridge
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- Refuse Collection & Disposal, Ronkonkoma
- Refuse Collection & Disposal Services, Ronkonkoma
- Refuse Systems & Garbage Disposal, Ronkonkoma
- Rehabilitation Centers, Products & Services, Ronkonkoma
- Rehabilitation Specialists, Ronkonkoma
- Rehabilitational Job Training Services, Ronkonkoma
- Religious Organizations, Ronkonkoma
- Relocation Services, Ronkonkoma
- Repair Services, Ronkonkoma
- Research & Development Bureaus, Ronkonkoma - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Ronkonkoma - Laboratories
- Research Services, Ronkonkoma
- Residential, Ronkonkoma
- Residential Apartments, Ronkonkoma
- Residential Care Facilities, Ronkonkoma
- Residential Construction Contractors, Ronkonkoma - General Contractors
- Residential Lighting Fixtures Manufacturers, Ronkonkoma
- Restaurant Management & Consulting, Ronkonkoma - Food Facilities Consultants
- Restaurants/Food & Dining, Ronkonkoma
- Restoration Contractors, Ronkonkoma
- Retail Book Stores, Ronkonkoma
- Retirement & Estate Planning, Ronkonkoma
- Retirement Communities & Home, Assisted Living & Apartments, Ronkonkoma
- Retirement Planning Consultants & Services, Ronkonkoma
- Retreat Facilities & Houses, Ronkonkoma
- Riding & Rodeo Services, Ronkonkoma
- Riding Apparel & Equipment, Ronkonkoma
- Road Construction, Ronkonkoma - Companies & Contractors
- Road Construction & Repair Contractors, Ronkonkoma
- Rodeo & Equestrian Equipment & Supplies, Ronkonkoma
- Rods, Springs & Suspension Equipment & Supplies, Ronkonkoma
- Roofing Consultants, Ronkonkoma - Roofing Companies
- Roofing Contractors, Ronkonkoma - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Ronkonkoma
- Ryder Truck Rental , Ronkonkoma - Ryder Moving
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