- Sandwich Shop Restaurants, Castaic
- Secondary Schools, Castaic
- Security & Surveillance System & Equipment, Castaic
- Security Alarm Systems - Home & Business, Castaic
- Security Control Systems & Monitoring, Castaic - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Castaic
- Shopping & Shopping Services, Castaic
- Snacks & Desserts, Castaic
- Social Services & Welfare, Castaic
- Societies & Foundation Associations, Castaic
- Sod & Sodding Service, Castaic
- Specialty Animal Services, Castaic
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- Specialty Stores, Castaic
- Specialty Vehicle Rental & Leasing, Castaic
- Sporting Goods Stores, Castaic
- Sprinkler System Contractors, Castaic - Garden & Lawn Sprinkler System Installation & Repair
- State Government, Castaic
- Stucco Siding Contractors, Castaic - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Castaic
- Submarine Sandwich Restaurants, Castaic
- Surveyor Services, Castaic - Surveying Service
- Sushi Restaurants, Castaic
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Castaic
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