- Safe Deposit Box Services, Castroville
- Sandwich Shop Restaurants, Castroville
- School - Catholic, Castroville
- School - Christian, Castroville
- Seafood Restaurants, Castroville
- Secondary Schools, Castroville
- Security & Surveillance System & Equipment, Castroville
- Security Brokers & Dealers, Castroville
- Security Services, Castroville
- Sheet Metal Contractors, Castroville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Castroville
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- Shopping & Shopping Services, Castroville
- Snacks & Desserts, Castroville
- Social Services & Welfare, Castroville
- Specialty Animal Services, Castroville
- Specialty Stores, Castroville
- Sporting & Recreational Camps, Castroville
- Sports & Recreational Services, Castroville
- Stocks & Bond Brokers, Castroville
- Surveyor Services, Castroville - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Castroville
- Swimming Pools Contractors, Castroville - Install Inground - Above Ground Pools
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