- Radiator Coolant & Solvents, Reston - Engine Coolant
- Radio Communications Equipment & Systems , Reston
- Radio Stations & Broadcasting Companies, Reston
- Radiologists, Reston - Radiology Doctors, Physicians & Surgeons
- Radiotelephone Communications, Reston
- Radon Testing & Services, Reston
- Real Estate, Reston - Agent, Broker & Companies
- Real Estate & Insurance Schools, Reston
- Real Estate Agencies, Reston
- Real Estate Agent - Property Lessors, Reston
- Real Estate Appraiser, Reston - Appraisal Services
- Real Estate Appraisers & Consulting Services, Reston
- Real Estate Consultants, Reston
- Real Estate Developers, Reston
- Real Estate Investment Trusts, Reston
- Real Estate Management, Reston
- Real Estate Rentals, Reston
- Real Estate Services, Reston
- Record Storage, Destruction & Management, Reston
- Recreational Organizations, Reston
- Reducing Exercise & Weight Control Services, Reston
- Reform Synagogues, Reston
- Rehabilitation Centers, Products & Services, Reston
- Rehabilitation Specialists, Reston
- Rehabilitational Job Training Services, Reston
- Religious Organizations, Reston
- Rental & Leasing Business Equipment, Reston
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- Repair Services, Reston
- Research & Development Bureaus, Reston - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Reston - Laboratories
- Research Services, Reston
- Residential, Reston
- Residential Apartments, Reston
- Residential Care Facilities, Reston
- Residential Construction Contractors, Reston - General Contractors
- Residential Real Estate Companies, Reston
- Resorts & Hotels, Reston
- Restaurant & Food Service Management Services, Reston
- Restaurant & Lounge, Bar, Or Pub, Reston
- Restaurant Management & Consulting, Reston - Food Facilities Consultants
- Restaurants/Food & Dining, Reston
- Resume Service, Reston
- Retail Book Stores, Reston
- Retirement & Estate Planning, Reston
- Retirement Communities & Home, Assisted Living & Apartments, Reston
- Retirement Homes, Reston
- Retirement Planning Consultants & Services, Reston
- Rheumatologists, Reston - Rheumatology Doctors, Physicians & Surgeons
- Road Construction, Reston - Companies & Contractors
- Road Construction & Repair Contractors, Reston
- Roofing Consultants, Reston - Roofing Companies
- Roofing Contractors, Reston - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Reston
- Rv Parks, Reston
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