- Racing Car Supplies, South Plainfield
- Radio & Television Repair Shops , South Plainfield - TV Repair
- Radiotelephone Communications, South Plainfield
- Ready Mix Concrete, South Plainfield - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, South Plainfield
- Real Estate, South Plainfield - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, South Plainfield
- Real Estate Appraisers & Consulting Services, South Plainfield
- Real Estate Attorneys & Lawyers, South Plainfield
- Real Estate Consultants, South Plainfield
- Real Estate Developers, South Plainfield
- Real Estate Lawyers & Attorneys, South Plainfield
- Real Estate Management, South Plainfield
- Real Estate Services, South Plainfield
- Recycling Drop-Off Centers, South Plainfield
- Recycling Scrap & Waste Materials, South Plainfield - Scrap Metal, etc
- Refrigerated Truck, South Plainfield
- Refuse Collection & Disposal Services, South Plainfield
- Refuse Systems & Garbage Disposal, South Plainfield
- Rehabilitation Centers, South Plainfield
- Rehabilitation Centers, Products & Services, South Plainfield
- Rehabilitation Specialists, South Plainfield
- Rehabilitational Job Training Services, South Plainfield
- Religious Education, South Plainfield
- Religious Organizations, South Plainfield
- Religious Schools Elementary Schools, South Plainfield
- Repair Services, South Plainfield
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- Repossession Services, South Plainfield
- Research & Development Bureaus, South Plainfield - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, South Plainfield - Laboratories
- Research Services, South Plainfield
- Residential, South Plainfield
- Residential Apartments, South Plainfield
- Residential Care Facilities, South Plainfield
- Residential Construction Contractors, South Plainfield - General Contractors
- Residential Real Estate Companies, South Plainfield
- Restaurant & Food Service Management Services, South Plainfield
- Restaurant Equipment, South Plainfield
- Restaurant Equipment & Supplies, South Plainfield
- Restaurant Lobster, South Plainfield
- Restaurant Management & Consulting, South Plainfield - Food Facilities Consultants
- Restaurant Supplies & Equipment, South Plainfield
- Restaurants/Food & Dining, South Plainfield
- Restoration Contractors, South Plainfield
- Retirement Communities & Home, Assisted Living & Apartments, South Plainfield
- Rigging Service & Crane Hoisting, South Plainfield
- Road Construction, South Plainfield - Companies & Contractors
- Road Construction & Repair Contractors, South Plainfield
- Roadside Assistance, Road Service & Towing Service, South Plainfield
- Roofing Consultants, South Plainfield - Roofing Companies
- Roofing Contractors, South Plainfield - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, South Plainfield
- Rubber Products - Retail, South Plainfield
- Ryder Truck Rental , South Plainfield - Ryder Moving
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