- Radiator Coolant & Solvents, Monongahela - Engine Coolant
- Radiator Repair, Monongahela - Gas Tank Repair
- Radiotelephone Communications, Monongahela
- Real Estate, Monongahela - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Monongahela
- Real Estate Appraiser, Monongahela - Appraisal Services
- Real Estate Appraisers & Consulting Services, Monongahela
- Real Estate Attorneys & Lawyers, Monongahela
- Real Estate Developers, Monongahela
- Real Estate Lawyers & Attorneys, Monongahela
- Real Estate Services, Monongahela
- Record Destruction Service, Monongahela
- Record Storage, Destruction & Management, Monongahela
- Recreational Organizations, Monongahela
- Recycling Scrap & Waste Materials, Monongahela - Scrap Metal, etc
- Rehabilitation Centers, Products & Services, Monongahela
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- Rehabilitation Specialists, Monongahela
- Religious Organizations, Monongahela
- Religious Practitioners, Monongahela
- Repair Services, Monongahela
- Research Service Libraries, Monongahela
- Research Services, Monongahela
- Residential Care Facilities, Monongahela
- Restaurant & Lounge, Bar, Or Pub, Monongahela
- Restaurants/Food & Dining, Monongahela
- Retaining Wall Contractors, Monongahela - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, Monongahela
- Rheumatologists, Monongahela - Rheumatology Doctors, Physicians & Surgeons
- Road Construction, Monongahela - Companies & Contractors
- Roofing Consultants, Monongahela - Roofing Companies
- Roofing Contractors, Monongahela - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products - Retail, Monongahela
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