- Racing Car Supplies, Sylmar
- Radiator Coolant & Solvents, Sylmar - Engine Coolant
- Radio & Television Repair Shops , Sylmar - TV Repair
- Radiotelephone Communications, Sylmar
- Raw Products, Sylmar
- Real Estate, Sylmar - Agent, Broker & Companies
- Real Estate Appraiser, Sylmar - Appraisal Services
- Real Estate Appraisers & Consulting Services, Sylmar
- Real Estate Developers, Sylmar
- Real Estate Services, Sylmar
- Record Storage, Destruction & Management, Sylmar
- Recreational Equipment & Supplies Companies, Sylmar
- Recreational Good Manufacturers, Sylmar
- Recreational Organizations, Sylmar
- Recreational Services, Sylmar
- Recycling Drop-Off Centers, Sylmar
- Refrigeration & Cooling Equipment, Parts & Supplies , Sylmar - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Sylmar - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Sylmar
- Refrigerator Sales, Service & Repair, Sylmar - Fridge
- Rehabilitation Centers, Products & Services, Sylmar
- Rehabilitation Specialists, Sylmar
- Religious Education, Sylmar
- Religious Organizations, Sylmar
- Religious Practitioners, Sylmar
- Repair Services, Sylmar
- Research Film Laboratories & Film Services Motion Pictures, Sylmar
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- Research Services, Sylmar
- Residential, Sylmar
- Residential Apartments, Sylmar
- Residential Architect, Sylmar
- Residential Care Facilities, Sylmar
- Residential Construction Contractors, Sylmar - General Contractors
- Residential Landfills, Sylmar
- Residential Lighting Fixtures Manufacturers, Sylmar
- Restaurant & Food Service Management Services, Sylmar
- Restaurants - Breakfast Brunch Lunch, Sylmar
- Restaurants/Food & Dining, Sylmar
- Retirement Communities & Home, Assisted Living & Apartments, Sylmar
- Retirement Homes, Sylmar
- Riding & Rodeo Services, Sylmar
- Rigging Service & Crane Hoisting, Sylmar
- Rock Shops, Sylmar
- Rodeo & Equestrian Equipment & Supplies, Sylmar
- Roller Skating Rinks, Sylmar
- Roofing Consultants, Sylmar - Roofing Companies
- Roofing Contractors, Sylmar - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products, Sylmar
- Rubber Products - Retail, Sylmar
- Rubbish Handling Equipment, Sylmar - Garbage Containers
- RV & Campers Repair & Service, Sylmar
- RV Repair, Sylmar - Recreational Vehicle
- Rvs Sales, Rental & Leasing, Sylmar
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