- Racing Apparel & Collectibles, Northridge
- Racing Car Supplies, Northridge
- Racing Engines, Northridge
- Radiator Coolant & Solvents, Northridge - Engine Coolant
- Radiator Repair, Northridge - Gas Tank Repair
- Radiator Repair & Rebuild, Northridge
- Radio & Television Repair Shops , Northridge - TV Repair
- Radio Stations & Broadcasting Companies, Northridge
- Radiology Equipment & Services, Northridge - X-Ray Equipment & Supplies
- Raw Products, Northridge
- Ready Mix Concrete, Northridge - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Northridge
- Real Estate, Northridge - Agent, Broker & Companies
- Real Estate & Insurance Schools, Northridge
- Real Estate Agent & Broker Services, Northridge
- Real Estate Agent - Property Lessors, Northridge
- Real Estate Appraiser, Northridge - Appraisal Services
- Real Estate Appraisers & Consulting Services, Northridge
- Real Estate Broker, Northridge
- Real Estate Consultants, Northridge
- Real Estate Developers, Northridge
- Real Estate Inspectors, Northridge - Real Estate Inspection Service
- Real Estate Management, Northridge
- Real Estate Properties, Northridge
- Real Estate Property Investment Properties, Northridge
- Real Estate Services, Northridge
- Record Storage, Destruction & Management, Northridge
- Records, Tapes, CDs - Used & Vintage, Northridge
- Recreational Equipment & Supplies Companies, Northridge
- Recreational Good Manufacturers, Northridge
- Recycling Drop-Off Centers, Northridge
- Reducing Exercise & Weight Control Services, Northridge
- Reflexologists, Northridge
- Refrigeration & Air Conditioning Contractors, Northridge - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Northridge - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Northridge - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Northridge - Fridge
- Rehabilitation Centers, Products & Services, Northridge
- Rehabilitation Specialists, Northridge
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- Religious Education, Northridge
- Religious Organizations, Northridge
- Religious Services, Northridge
- Rental & Leasing Business Equipment, Northridge
- Rental Property Management, Northridge
- Repair Services, Northridge
- Repossession Services, Northridge
- Research & Development Bureaus, Northridge - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Northridge - Laboratories
- Research Services, Northridge
- Residential, Northridge
- Residential Apartments, Northridge
- Residential Architect, Northridge
- Residential Care Facilities, Northridge
- Residential Construction Contractors, Northridge - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Northridge
- Restaurant Architects, Northridge
- Restaurant Equipment, Northridge
- Restaurant Equipment & Supplies Manufacturers, Northridge
- Restaurant Management & Consulting, Northridge - Food Facilities Consultants
- Restaurants - Breakfast Brunch Lunch, Northridge
- Restaurants/Food & Dining, Northridge
- Resume Service, Northridge
- Retail Book Stores, Northridge
- Retirement Communities & Home, Assisted Living & Apartments, Northridge
- Retirement Home Referral Service, Northridge - Nursing Home & Care Facilities Referrals & Information
- Rheumatologists, Northridge - Rheumatology Doctors, Physicians & Surgeons
- Riding & Rodeo Services, Northridge
- Rifle & Pistol Ranges, Northridge
- Rigging Service & Crane Hoisting, Northridge
- Roofing Consultants, Northridge - Roofing Companies
- Roofing Contractors, Northridge - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rooming & Boarding Houses, Northridge
- Rubber Products, Northridge
- Rubber Stamps, Northridge
- Rv Parks, Northridge
- RV Repair, Northridge - Recreational Vehicle
- Ryder Truck Rental , Northridge - Ryder Moving
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