- Racing Car Supplies, Gwynn Oak
- Radio & Television Repair Shops , Gwynn Oak - TV Repair
- Radio Stations & Broadcasting Companies, Gwynn Oak
- Real Estate, Gwynn Oak - Agent, Broker & Companies
- Real Estate Appraiser, Gwynn Oak - Appraisal Services
- Real Estate Appraisers & Consulting Services, Gwynn Oak
- Real Estate Consultants, Gwynn Oak
- Real Estate Management, Gwynn Oak
- Real Estate Services, Gwynn Oak
- Recording Studio - Equipment & Rental, Gwynn Oak
- Recording Studio Service - Sound & Video, Gwynn Oak
- Recreational Services, Gwynn Oak
- Recycling Drop-Off Centers, Gwynn Oak
- Reducing Exercise & Weight Control Services, Gwynn Oak
- Rehabilitation Centers, Products & Services, Gwynn Oak
- Rehabilitation Specialists, Gwynn Oak
- Religious Organizations, Gwynn Oak
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- Religious Practitioners, Gwynn Oak
- Religious Services, Gwynn Oak
- Rental & Leasing Business Equipment, Gwynn Oak
- Rental Property Management, Gwynn Oak
- Repair Services, Gwynn Oak
- Research Services, Gwynn Oak
- Residential, Gwynn Oak
- Residential Apartments, Gwynn Oak
- Residential Care Facilities, Gwynn Oak
- Residential Construction Contractors, Gwynn Oak - General Contractors
- Restaurants/Food & Dining, Gwynn Oak
- Retail Book Stores, Gwynn Oak
- Retirement Communities & Home, Assisted Living & Apartments, Gwynn Oak
- Rigging Equipment & Supplies, Gwynn Oak
- Roadside Assistance, Road Service & Towing Service, Gwynn Oak
- Roofing Materials & Supplies, Gwynn Oak
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