- Radio & Tv Communications Equipment Manufacturers, Ashburn
- Radiotelephone Communications, Ashburn
- Ready Mix Concrete, Ashburn - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Ashburn
- Real Estate, Ashburn - Agent, Broker & Companies
- Real Estate & Property Brokers, Ashburn
- Real Estate Agencies, Ashburn
- Real Estate Agent - Property Lessors, Ashburn
- Real Estate Appraisers & Consulting Services, Ashburn
- Real Estate Consultants, Ashburn
- Real Estate Developers, Ashburn
- Real Estate Management, Ashburn
- Real Estate Services, Ashburn
- Recreational Good Manufacturers, Ashburn
- Recycling Drop-Off Centers, Ashburn
- Reducing Exercise & Weight Control Services, Ashburn
- Refrigeration Repair & Service, Ashburn - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal Services, Ashburn
- Rehabilitation Centers, Ashburn
- Rehabilitation Specialists, Ashburn
- Religious Education, Ashburn
- Religious Organizations, Ashburn
- Relocation Services, Ashburn
- Rental & Leasing Business Equipment, Ashburn
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- Rental Property Management, Ashburn
- Repair Services, Ashburn
- Research & Development Bureaus, Ashburn - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Ashburn - Laboratories
- Research Services, Ashburn
- Residential, Ashburn
- Residential Apartments, Ashburn
- Residential Architect, Ashburn
- Residential Construction Contractors, Ashburn - General Contractors
- Resorts & Hotels, Ashburn
- Restaurant & Food Service Management Services, Ashburn
- Restaurant Equipment, Ashburn
- Restaurant Equipment & Supplies, Ashburn
- Restaurant Management & Consulting, Ashburn - Food Facilities Consultants
- Restaurant Supplies & Equipment, Ashburn
- Restaurants/Food & Dining, Ashburn
- Retirement & Estate Planning, Ashburn
- Retirement Communities & Home, Assisted Living & Apartments, Ashburn
- Retirement Homes, Ashburn
- Retirement Planning Consultants & Services, Ashburn
- Riding & Rodeo Services, Ashburn
- Roofing Consultants, Ashburn - Roofing Companies
- Roofing Contractors, Ashburn - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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