- Radio Stations & Broadcasting Companies, Castaic
- Real Estate, Castaic - Agent, Broker & Companies
- Real Estate Appraiser, Castaic - Appraisal Services
- Real Estate Appraisers & Consulting Services, Castaic
- Real Estate Developers, Castaic
- Real Estate Inspectors, Castaic - Real Estate Inspection Service
- Real Estate Services, Castaic
- Recording Studio - Equipment & Rental, Castaic
- Recreation Facilities Management, Castaic
- Recreation Management Services, Castaic
- Refrigeration & Cooling Equipment, Parts & Supplies , Castaic - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Castaic - Ac, Freezer, Refrigerator Repair
- Religious Goods & Church Supplies Stores, Castaic
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- Religious Organizations, Castaic
- Repair Services, Castaic
- Residential, Castaic
- Residential Apartments, Castaic
- Residential Architect, Castaic
- Residential Landfills, Castaic
- Resorts & Hotels, Castaic
- Restaurant & Food Service Management Services, Castaic
- Restaurants - Breakfast Brunch Lunch, Castaic
- Restaurants/Food & Dining, Castaic
- Roofing Consultants, Castaic - Roofing Companies
- Roofing Contractors, Castaic - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Castaic
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