- Radio & Television Repair Shops , King of Prussia - TV Repair
- Radiologists, King of Prussia - Radiology Doctors, Physicians & Surgeons
- Ready Mix Concrete, King of Prussia - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, King of Prussia
- Real Estate, King of Prussia - Agent, Broker & Companies
- Real Estate Appraiser, King of Prussia - Appraisal Services
- Real Estate Appraisers & Consulting Services, King of Prussia
- Real Estate Consultants, King of Prussia
- Real Estate Developers, King of Prussia
- Real Estate Exchanges, King of Prussia
- Real Estate Management, King of Prussia
- Real Estate Properties, King of Prussia
- Real Estate Property Investment Properties, King of Prussia
- Real Estate Services, King of Prussia
- Real Estate Services Franchises, King of Prussia
- Recording Studio - Equipment & Rental, King of Prussia
- Records, Tapes, CDs - Used & Vintage, King of Prussia
- Recycling Drop-Off Centers, King of Prussia
- Recycling Scrap & Waste Materials, King of Prussia - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, King of Prussia
- Reform Synagogues, King of Prussia
- Refrigeration & Cooling Equipment, Parts & Supplies , King of Prussia - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, King of Prussia - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, King of Prussia
- Refuse Collection & Disposal, King of Prussia
- Refuse Collection & Disposal Services, King of Prussia
- Refuse Systems & Garbage Disposal, King of Prussia
- Rehabilitation Centers, Products & Services, King of Prussia
- Rehabilitation Specialists, King of Prussia
- Rehabilitational Job Training Services, King of Prussia
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- Religious Organizations, King of Prussia
- Religious Practitioners, King of Prussia
- Relocation Services, King of Prussia
- Rental & Leasing Business Equipment, King of Prussia
- Repair Services, King of Prussia
- Research & Development Bureaus, King of Prussia - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, King of Prussia - Laboratories
- Research Services, King of Prussia
- Residential, King of Prussia
- Residential Apartments, King of Prussia
- Residential Care Facilities, King of Prussia
- Residential Construction Contractors, King of Prussia - General Contractors
- Residential Real Estate Companies, King of Prussia
- Resorts & Hotels, King of Prussia
- Restaurant & Food Service Management Services, King of Prussia
- Restaurant Equipment, King of Prussia
- Restaurant Equipment & Supplies, King of Prussia
- Restaurant Lobster, King of Prussia
- Restaurant Management & Consulting, King of Prussia - Food Facilities Consultants
- Restaurant Supplies & Equipment, King of Prussia
- Restaurants/Food & Dining, King of Prussia
- Retail Book Stores, King of Prussia
- Rheem / Rudd Heating & Air Conditioning Contractors, King of Prussia - Air Conditioner Contractors & Systems
- Riding & Rodeo Services, King of Prussia
- Road Construction, King of Prussia - Companies & Contractors
- Roofing Consultants, King of Prussia - Roofing Companies
- Roofing Contractors, King of Prussia - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, King of Prussia
- Rubber Manufacturers Supplies, King of Prussia
- Ryder Truck Rental , King of Prussia - Ryder Moving
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