- Salvation Army, Castroville
- Scrap & Waste Materials, Castroville
- Secondary Schools, Castroville
- Septic Tanks & Septic Systems Contractors, Castroville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Establishment Supplies & Equipment, Castroville
- Sheet Metal Contractors, Castroville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Castroville
- Shopping & Shopping Services, Castroville
- Siding Materials, Castroville
- Skin Care & Cosmetology Salons, Castroville
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- Skin Care Products & Treatments, Castroville
- Social Services & Welfare, Castroville
- Societies & Foundation Associations, Castroville
- Solar Energy Companies - Contractors, Castroville - Solar Panel Installation - Solar Power Systems
- Specialty Stores, Castroville
- Sprinkler Alarm Systems, Castroville - Fire Sprinkler Systems
- Stoves & Furnace Equipment, Castroville - Fittings & Repair Parts
- Stucco Siding Contractors, Castroville - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Castroville
- Surplus & Salvage Merchandise, Castroville
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