- Racing Including Track Operations, Carnegie
- Radiator Coolant & Solvents, Carnegie - Engine Coolant
- Radiator Repair, Carnegie - Gas Tank Repair
- Radiator Repair - Auto & Industrial, Carnegie
- Radio & Television Repair Shops , Carnegie - TV Repair
- Radon Testing & Services, Carnegie
- Railroad, Carnegie - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Carnegie
- Railroad Companies, Carnegie
- Railroad Contractors, Carnegie
- Railroad Services, Carnegie
- Ready Mix Concrete, Carnegie - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Carnegie
- Real Estate, Carnegie - Agent, Broker & Companies
- Real Estate Developers, Carnegie
- Real Estate Management, Carnegie
- Real Estate Services, Carnegie
- Recording Studio - Equipment & Rental, Carnegie
- Recreational Organizations, Carnegie
- Recycling Scrap & Waste Materials, Carnegie - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Carnegie
- Refractory Systems & Materials, Carnegie
- Refrigeration & Air Conditioning Contractors, Carnegie - Installation, Repair, Sales & Service
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- Rehabilitation Centers, Products & Services, Carnegie
- Rehabilitation Specialists, Carnegie
- Religious Organizations, Carnegie
- Religious Practitioners, Carnegie
- Repair Services, Carnegie
- Research Services, Carnegie
- Residential, Carnegie
- Residential Apartments, Carnegie
- Residential Care Facilities, Carnegie
- Residential Construction Contractors, Carnegie - General Contractors
- Restaurant Equipment Cleaning, Carnegie - Restaurant Cleaners
- Restaurant Management & Consulting, Carnegie - Food Facilities Consultants
- Restaurants/Food & Dining, Carnegie
- Restoration Contractors, Carnegie
- Retaining Wall Contractors, Carnegie - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, Carnegie
- Rigging Service & Crane Hoisting, Carnegie
- Risk Management Consultants, Carnegie
- Road Construction, Carnegie - Companies & Contractors
- Roofing Consultants, Carnegie - Roofing Companies
- Roofing Contractors, Carnegie - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Carnegie
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