- Ready Mix Concrete, Rockville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Rockville
- Real Estate, Rockville - Agent, Broker & Companies
- Real Estate Services, Rockville
- Recycling Drop-Off Centers, Rockville
- Refuse Collection & Disposal, Rockville
- Refuse Systems & Garbage Disposal, Rockville
- Religious Organizations, Rockville
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- Repair Services, Rockville
- Residential Construction Contractors, Rockville - General Contractors
- Residential Landfills, Rockville
- Restaurants/Food & Dining, Rockville
- Road Construction, Rockville - Companies & Contractors
- Road Construction & Repair Contractors, Rockville
- Roofing Consultants, Rockville - Roofing Companies
- Roofing Contractors, Rockville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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