- Racquetball Courts, Catonsville
- Radio & Television Repair Shops , Catonsville - TV Repair
- Radiologists, Catonsville - Radiology Doctors, Physicians & Surgeons
- Radon Testing & Services, Catonsville
- Real Estate, Catonsville - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Catonsville
- Real Estate Appraiser, Catonsville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Catonsville
- Real Estate Consultants, Catonsville
- Real Estate Developers, Catonsville
- Real Estate Management, Catonsville
- Real Estate Rentals, Catonsville
- Real Estate Services, Catonsville
- Record Storage, Destruction & Management, Catonsville
- Recording Studio - Equipment & Rental, Catonsville
- Recording Studio Service - Sound & Video, Catonsville
- Records, Tapes, CDs - Used & Vintage, Catonsville
- Recreational Services, Catonsville
- Red Wing Shoes, Catonsville
- Reducing Exercise & Weight Control Services, Catonsville
- Reflexologists, Catonsville
- Reformed Churches, Catonsville
- Refrigeration & Cooling Equipment, Parts & Supplies , Catonsville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Catonsville - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Catonsville - Fridge
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- Rehabilitation Centers, Products & Services, Catonsville
- Rehabilitation Specialists, Catonsville
- Religious Organizations, Catonsville
- Religious Practitioners, Catonsville
- Rental & Leasing Business Equipment, Catonsville
- Rental Property Management, Catonsville
- Repair Services, Catonsville
- Research & Development Bureaus, Catonsville - Commercial, Economic, Sociological & Educational Research
- Research Services, Catonsville
- Residential, Catonsville
- Residential Apartments, Catonsville
- Residential Care Facilities, Catonsville
- Residential Construction Contractors, Catonsville - General Contractors
- Restaurant & Food Service Management Services, Catonsville
- Restaurant Equipment Repair & Service, Catonsville - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants/Food & Dining, Catonsville
- Resume Service, Catonsville
- Retirement Communities & Home, Assisted Living & Apartments, Catonsville
- Rheumatologists, Catonsville - Rheumatology Doctors, Physicians & Surgeons
- Road Construction, Catonsville - Companies & Contractors
- Road Construction & Repair Contractors, Catonsville
- Roofing Consultants, Catonsville - Roofing Companies
- Roofing Contractors, Catonsville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Room Additions, Catonsville - Room Addition Contractors
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