- Radio Broadcasting Program Producers, Walkersville
- Radio Stations & Broadcasting Companies, Walkersville
- Railroad Companies, Walkersville
- Real Estate, Walkersville - Agent, Broker & Companies
- Real Estate Appraiser, Walkersville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Walkersville
- Real Estate Services, Walkersville
- Record Storage, Destruction & Management, Walkersville
- Refrigeration & Cooling Equipment, Parts & Supplies , Walkersville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Walkersville - Ac, Freezer, Refrigerator Repair
- Rehabilitation Centers, Products & Services, Walkersville
- Rehabilitation Specialists, Walkersville
- Relief Organizations, Walkersville
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- Religious Organizations, Walkersville
- Relocation Services, Walkersville
- Repair Services, Walkersville
- Residential, Walkersville
- Residential Construction Contractors, Walkersville - General Contractors
- Restaurant Equipment, Walkersville
- Restaurant Equipment & Supplies, Walkersville
- Restaurant Equipment Repair & Service, Walkersville - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, Walkersville
- Restaurants/Food & Dining, Walkersville
- Retirement Communities & Home, Assisted Living & Apartments, Walkersville
- Roofing Consultants, Walkersville - Roofing Companies
- Roofing Contractors, Walkersville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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