- Railroad, Altadena - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Altadena
- Railroad Contractors, Altadena
- Reading Instruction Schools, Altadena
- Real Estate, Altadena - Agent, Broker & Companies
- Real Estate Appraiser, Altadena - Appraisal Services
- Real Estate Appraisers & Consulting Services, Altadena
- Real Estate Attorneys & Lawyers, Altadena
- Real Estate Attorneys & Lawyers, Altadena
- Real Estate Lawyers & Attorneys, Altadena
- Real Estate Rentals, Altadena
- Real Estate Services, Altadena
- Refuse Systems & Garbage Disposal, Altadena
- Rehabilitation Centers, Products & Services, Altadena
- Rehabilitation Specialists, Altadena
- Religious Education, Altadena
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- Religious Goods & Church Supplies Stores, Altadena
- Religious Organizations, Altadena
- Repair Services, Altadena
- Research & Development Bureaus, Altadena - Commercial, Economic, Sociological & Educational Research
- Research Services, Altadena
- Residential, Altadena
- Residential Apartments, Altadena
- Residential Architect, Altadena
- Residential Care Facilities, Altadena
- Restaurants - Breakfast Brunch Lunch, Altadena
- Restaurants/Food & Dining, Altadena
- Retirement Communities & Home, Assisted Living & Apartments, Altadena
- Riding & Rodeo Services, Altadena
- Roofing Consultants, Altadena - Roofing Companies
- Roofing Contractors, Altadena - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Altadena
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