- Racing Including Track Operations, Fort Washington
- Rail Line Travel Agents & Agencies, Fort Washington
- Railroad, Fort Washington - Commuter & Passenger Transport
- Railroad Companies, Fort Washington
- Railroad Services, Fort Washington
- Ready Mix Concrete, Fort Washington - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Fort Washington
- Real Estate, Fort Washington - Agent, Broker & Companies
- Real Estate Appraiser, Fort Washington - Appraisal Services
- Real Estate Appraisers & Consulting Services, Fort Washington
- Real Estate Developers, Fort Washington
- Real Estate Management, Fort Washington
- Real Estate Services, Fort Washington
- Record Storage, Destruction & Management, Fort Washington
- Recording Studio - Equipment & Rental, Fort Washington
- Recording Studio Service - Sound & Video, Fort Washington
- Recreational Organizations, Fort Washington
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- Recycling Drop-Off Centers, Fort Washington
- Rehabilitation Centers, Products & Services, Fort Washington
- Rehabilitation Specialists, Fort Washington
- Rehabilitational Job Training Services, Fort Washington
- Religious Organizations, Fort Washington
- Repair Services, Fort Washington
- Residential, Fort Washington
- Residential Apartments, Fort Washington
- Residential Construction Contractors, Fort Washington - General Contractors
- Residential Landfills, Fort Washington
- Resource Centers, Fort Washington
- Restaurant Management & Consulting, Fort Washington - Food Facilities Consultants
- Restaurants/Food & Dining, Fort Washington
- Retail Book Stores, Fort Washington
- Road Construction, Fort Washington - Companies & Contractors
- Roofing Consultants, Fort Washington - Roofing Companies
- Roofing Contractors, Fort Washington - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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