- Ready Mix Concrete, Stittsville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Stittsville
- Real Estate, Stittsville - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Stittsville
- Real Estate Agent - Property Lessors, Stittsville
- Real Estate Appraiser, Stittsville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Stittsville
- Real Estate Broker, Stittsville
- Real Estate Developers, Stittsville
- Real Estate Services, Stittsville
- Record Storage, Destruction & Management, Stittsville
- Recreational Services, Stittsville
- Reducing Exercise & Weight Control Services, Stittsville
- Refuse Collection & Disposal Services, Stittsville
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- Religious Organizations, Stittsville
- Repair Services, Stittsville
- Research Services, Stittsville
- Residential, Stittsville
- Residential Apartments, Stittsville
- Residential Care Facilities, Stittsville
- Residential Construction Contractors, Stittsville - General Contractors
- Restaurants/Food & Dining, Stittsville
- Retirement Communities & Home, Assisted Living & Apartments, Stittsville
- Riding & Rodeo Services, Stittsville
- Rifle & Pistol Ranges, Stittsville
- Roofing Consultants, Stittsville - Roofing Companies
- Roofing Contractors, Stittsville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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