- Radiator Coolant & Solvents, West Mifflin - Engine Coolant
- Radio & Television Repair Shops , West Mifflin - TV Repair
- Real Estate, West Mifflin - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, West Mifflin
- Real Estate Management, West Mifflin
- Real Estate Rentals, West Mifflin
- Real Estate Services, West Mifflin
- Recording Studio - Equipment & Rental, West Mifflin
- Records, Tapes, CDs - Used & Vintage, West Mifflin
- Recreational Good Manufacturers, West Mifflin
- Recycling Drop-Off Centers, West Mifflin
- Recycling Scrap & Waste Materials, West Mifflin - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, West Mifflin
- Rehabilitation Centers, Products & Services, West Mifflin
- Rehabilitation Specialists, West Mifflin
- Rehabilitational Job Training Services, West Mifflin
- Religious Goods & Church Supplies Stores, West Mifflin
- Religious Organizations, West Mifflin
- Rental & Leasing Business Equipment, West Mifflin
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- Repair Services, West Mifflin
- Research & Development Labs, West Mifflin - Laboratories
- Research Services, West Mifflin
- Residential, West Mifflin
- Residential Apartments, West Mifflin
- Residential Care Facilities, West Mifflin
- Restaurant & Lounge, Bar, Or Pub, West Mifflin
- Restaurant Equipment, West Mifflin
- Restaurant Equipment & Supplies, West Mifflin
- Restaurant Equipment Repair & Service, West Mifflin - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, West Mifflin
- Restaurants/Food & Dining, West Mifflin
- Retail Book Stores, West Mifflin
- Retirement Communities & Home, Assisted Living & Apartments, West Mifflin
- Rigging Service & Crane Hoisting, West Mifflin
- Roofing Consultants, West Mifflin - Roofing Companies
- Roofing Contractors, West Mifflin - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, West Mifflin
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