- Radiator Repair, Pittsburg - Gas Tank Repair
- Radio Communications Equipment & Systems , Pittsburg
- Radio Stations & Broadcasting Companies, Pittsburg
- Radiologists, Pittsburg - Radiology Doctors, Physicians & Surgeons
- Railroad, Pittsburg - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Pittsburg
- Railroad Companies, Pittsburg
- Railroad Contractors, Pittsburg
- Railroad Repair & Maintenance, Pittsburg
- Ready Mix Concrete, Pittsburg - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Pittsburg
- Real Estate, Pittsburg - Agent, Broker & Companies
- Real Estate Appraiser, Pittsburg - Appraisal Services
- Real Estate Appraisers & Consulting Services, Pittsburg
- Real Estate Farms & Ranches, Pittsburg
- Real Estate Inspectors, Pittsburg - Real Estate Inspection Service
- Real Estate Loans & Contracts, Pittsburg
- Real Estate Management, Pittsburg
- Real Estate Properties, Pittsburg
- Real Estate Rentals, Pittsburg
- Real Estate Services, Pittsburg
- Record Storage, Destruction & Management, Pittsburg
- Recreational Equipment & Supplies Companies, Pittsburg
- Recreational Good Manufacturers, Pittsburg
- Recreational Services, Pittsburg
- Recycling Drop-Off Centers, Pittsburg
- Reducing Exercise & Weight Control Services, Pittsburg
- Refuse Collection & Disposal Services, Pittsburg
- Refuse Systems & Garbage Disposal, Pittsburg
- Rehabilitation Centers, Products & Services, Pittsburg
- Rehabilitation Specialists, Pittsburg
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- Rehabilitational Job Training Services, Pittsburg
- Relief Organizations, Pittsburg
- Religious Education, Pittsburg
- Religious Goods & Church Supplies Stores, Pittsburg
- Religious Organizations, Pittsburg
- Rent To Own Furniture, Pittsburg
- Rental & Leasing Business Equipment, Pittsburg
- Repair Services, Pittsburg
- Research & Development Bureaus, Pittsburg - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Pittsburg - Laboratories
- Research Services, Pittsburg
- Residential, Pittsburg
- Residential Apartments, Pittsburg
- Residential Architect, Pittsburg
- Residential Care Facilities, Pittsburg
- Residential Construction Contractors, Pittsburg - General Contractors
- Restaurant Management & Consulting, Pittsburg - Food Facilities Consultants
- Restaurants/Food & Dining, Pittsburg
- Retail Book Stores, Pittsburg
- Retirement & Estate Planning, Pittsburg
- Retirement Communities & Home, Assisted Living & Apartments, Pittsburg
- Retirement Planning Consultants & Services, Pittsburg
- Road Construction, Pittsburg - Companies & Contractors
- Rock & Lime Hauling, Pittsburg
- Roller Skating Rinks, Pittsburg
- Roofing Consultants, Pittsburg - Roofing Companies
- Roofing Contractors, Pittsburg - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Pittsburg
- Rooming & Boarding Houses, Pittsburg
- Ryder Truck Rental , Pittsburg - Ryder Moving
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