- Racquetball Courts, Diamond Bar
- Radiator Coolant & Solvents, Diamond Bar - Engine Coolant
- Radio & Television Repair Shops , Diamond Bar - TV Repair
- Radiotelephone Communications, Diamond Bar
- Range & Oven Repair, Service & Sales, Diamond Bar
- Reading Instruction Schools, Diamond Bar
- Real Estate, Diamond Bar - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Diamond Bar
- Real Estate Appraiser, Diamond Bar - Appraisal Services
- Real Estate Appraisers & Consulting Services, Diamond Bar
- Real Estate Consultants, Diamond Bar
- Real Estate Developers, Diamond Bar
- Real Estate Management, Diamond Bar
- Real Estate Properties, Diamond Bar
- Real Estate Property Investment Properties, Diamond Bar
- Real Estate Rentals, Diamond Bar
- Real Estate Services, Diamond Bar
- Record Labels, Diamond Bar - Record Companies
- Record Storage, Destruction & Management, Diamond Bar
- Recreation Management Services, Diamond Bar
- Recreational Good Manufacturers, Diamond Bar
- Recreational Services, Diamond Bar
- Recycling Drop-Off Centers, Diamond Bar
- Recycling Scrap & Waste Materials, Diamond Bar - Scrap Metal, etc
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- Reducing Exercise & Weight Control Services, Diamond Bar
- Refrigeration & Cooling Equipment, Parts & Supplies , Diamond Bar - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Diamond Bar - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Diamond Bar - Fridge
- Rehabilitation Centers, Products & Services, Diamond Bar
- Rehabilitation Specialists, Diamond Bar
- Religious Organizations, Diamond Bar
- Religious Services, Diamond Bar
- Repair Services, Diamond Bar
- Repossession Services, Diamond Bar
- Research & Development Bureaus, Diamond Bar - Commercial, Economic, Sociological & Educational Research
- Research Services, Diamond Bar
- Residential, Diamond Bar
- Residential Apartments, Diamond Bar
- Residential Care Facilities, Diamond Bar
- Residential Construction Contractors, Diamond Bar - General Contractors
- Residential Lighting Fixtures Manufacturers, Diamond Bar
- Restaurant Management & Consulting, Diamond Bar - Food Facilities Consultants
- Restaurants - Breakfast Brunch Lunch, Diamond Bar
- Restaurants/Food & Dining, Diamond Bar
- Retirement Communities & Home, Assisted Living & Apartments, Diamond Bar
- Road Boring Contractors, Diamond Bar
- Roofing Consultants, Diamond Bar - Roofing Companies
- Roofing Contractors, Diamond Bar - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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