- Radio & Television Repair Shops , Thurmont - TV Repair
- Radio Communications Equipment & Systems , Thurmont
- Radio Equipment & Parts Stores & Dealers, Thurmont
- Radio Stations & Broadcasting Companies, Thurmont
- Real Estate, Thurmont - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Thurmont
- Real Estate Appraisers & Consulting Services, Thurmont
- Real Estate Broker, Thurmont
- Real Estate Consultants, Thurmont
- Real Estate Management, Thurmont
- Real Estate Rentals, Thurmont
- Real Estate Services, Thurmont
- Recording Instruments Industrial & Scientific, Thurmont
- Recording Studio - Equipment & Rental, Thurmont
- Recording Studio Service - Sound & Video, Thurmont
- Recreational Organizations, Thurmont
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- Refuse Collection & Disposal, Thurmont
- Refuse Collection & Disposal Services, Thurmont
- Refuse Systems & Garbage Disposal, Thurmont
- Religious Organizations, Thurmont
- Repair Services, Thurmont
- Research Services, Thurmont
- Residential, Thurmont
- Residential Apartments, Thurmont
- Residential Construction Contractors, Thurmont - General Contractors
- Restaurants/Food & Dining, Thurmont
- Riding & Rodeo Services, Thurmont
- Roofing Consultants, Thurmont - Roofing Companies
- Roofing Contractors, Thurmont - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Thurmont
- Rv Parks, Thurmont
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