- Radio Stations & Broadcasting Companies, Plainsboro
- Real Estate, Plainsboro - Agent, Broker & Companies
- Real Estate Agencies, Plainsboro
- Real Estate Developers, Plainsboro
- Real Estate Management, Plainsboro
- Real Estate Services, Plainsboro
- Rehabilitation Centers, Plainsboro
- Rehabilitation Centers, Products & Services, Plainsboro
- Rehabilitation Specialists, Plainsboro
- Religious Organizations, Plainsboro
- Religious Practitioners, Plainsboro
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- Repair Services, Plainsboro
- Research & Development Bureaus, Plainsboro - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Plainsboro - Laboratories
- Research Services, Plainsboro
- Residential, Plainsboro
- Residential Apartments, Plainsboro
- Residential Construction Contractors, Plainsboro - General Contractors
- Restaurants/Food & Dining, Plainsboro
- Retirement Communities & Home, Assisted Living & Apartments, Plainsboro
- Riding & Rodeo Services, Plainsboro
- Rv Parks, Plainsboro
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