- Radiator Coolant & Solvents, Castroville - Engine Coolant
- Radio & Television Repair Shops , Castroville - TV Repair
- Real Estate, Castroville - Agent, Broker & Companies
- Real Estate Services, Castroville
- Record Destruction Service, Castroville
- Record Storage, Destruction & Management, Castroville
- Recreational Services, Castroville
- Recycling Drop-Off Centers, Castroville
- Recycling Scrap & Waste Materials, Castroville - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Castroville
- Refrigeration & Cooling Equipment, Parts & Supplies , Castroville - Water Cooler, Ice Machine, Beverage Dispenser, etc
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- Religious Organizations, Castroville
- Residential, Castroville
- Residential Apartments, Castroville
- Restaurants/Food & Dining, Castroville
- Rock Shops, Castroville
- Roofing Consultants, Castroville - Roofing Companies
- Roofing Contractors, Castroville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Castroville
- RV & Campers Repair & Service, Castroville
- RV Repair, Castroville - Recreational Vehicle
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