- Radio & Television Repair Shops , Tarentum - TV Repair
- Railroad Engineer, Tarentum
- Ready Mix Concrete, Tarentum - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Tarentum
- Real Estate, Tarentum - Agent, Broker & Companies
- Real Estate Developers, Tarentum
- Real Estate Services, Tarentum
- Record Storage, Destruction & Management, Tarentum
- Recreational Equipment Repair & Service, Tarentum
- Recreational Good Manufacturers, Tarentum
- Recreational Organizations, Tarentum
- Recycling Drop-Off Centers, Tarentum
- Recycling Scrap & Waste Materials, Tarentum - Scrap Metal, etc
- Religious Organizations, Tarentum
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- Religious Practitioners, Tarentum
- Repair Services, Tarentum
- Research & Development Bureaus, Tarentum - Commercial, Economic, Sociological & Educational Research
- Research Services, Tarentum
- Residential, Tarentum
- Residential Apartments, Tarentum
- Residential Care Facilities, Tarentum
- Residential Construction Contractors, Tarentum - General Contractors
- Restaurant Equipment, Tarentum
- Restaurant Equipment & Supplies, Tarentum
- Restaurant Supplies & Equipment, Tarentum
- Restaurants/Food & Dining, Tarentum
- Retirement Communities & Home, Assisted Living & Apartments, Tarentum
- Rv Parks, Tarentum
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