- Sales & Marketing Consultant, Castro Valley
- Salvation Army, Castro Valley
- Sandwich Shop Restaurants, Castro Valley
- Satellite Descrambling & Programming Service, Castro Valley
- Satellite Dish Antennas & Equipment Dealers, Castro Valley
- Satellite TV Service, Castro Valley
- Savings Banks, Castro Valley
- School - Catholic, Castro Valley
- School - Christian, Castro Valley
- Scientific Equipment & Services, Castro Valley
- Scientific Services, Castro Valley
- Screen Printing, Castro Valley
- Screens Doors & Windows, Castro Valley
- Secondary Schools, Castro Valley
- Secretarial & Court Reporting Services, Castro Valley
- Security & Surveillance System & Equipment, Castro Valley
- Security Alarm Systems - Home & Business, Castro Valley
- Security Brokers & Dealers, Castro Valley
- Security Control Systems & Monitoring, Castro Valley - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Castro Valley - Bodyguard, Guard Dogs, Etc
- Security Services, Castro Valley
- Senior Citizens Housing, Castro Valley
- Senior Citizens Service & Health Organizations, Castro Valley
- Sewer & Drain Cleaning & Repair, Castro Valley - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Castro Valley - Sewer Line, Pipe Installation & Repair Services
- Sewer System Inspection Service, Castro Valley
- Sharpening Service, Castro Valley
- Sheet Metal Contractors, Castro Valley - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Castro Valley
- Shoe Repair Shops, Castro Valley
- Shoe Stores, Castro Valley - Mens, Womens & Kids Shoes
- Shooting & Target Ranges, Castro Valley
- Shopping & Shopping Services, Castro Valley
- Shutters - Interior & Exterior, Castro Valley - Wood, Vinyl, Window, Plantation Shutters, etc
- Siding Contractors, Castro Valley - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Skin Care & Cosmetology Salons, Castro Valley
- Skin Care Products & Treatments, Castro Valley
- Smog Check, Brake & Lamp Inspection & Repair, Castro Valley
- Snacks & Desserts, Castro Valley
- Soccer Clubs, Castro Valley
- Social Clubs & Organizations, Castro Valley
- Social Services & Welfare, Castro Valley
- Social Workers & Services, Castro Valley
- Solar Equipment, Castro Valley
- Solar Products & Services, Castro Valley
- Soup & Salad Restaurants, Castro Valley
- Special Education & Care, Castro Valley
- Special Interest Schools Or Instruction, Castro Valley
- Specialty Animal Services, Castro Valley
- Specialty Stores, Castro Valley
- Speech & Hearing Specialists, Castro Valley
- Sporting Goods Stores, Castro Valley
- Sports & Recreational Services, Castro Valley
- Sports Medicine, Castro Valley - Doctors, Physicians & Surgeons
- Sportswear Clothing Stores, Castro Valley - Sports Clothes
- Staffing & Support Services, Castro Valley
- Stamp Collecting & Coin Dealers , Castro Valley
- State Government, Castro Valley
- Steak House Restaurants, Castro Valley
- Stock & Bond Brokers & Dealers, Castro Valley
- Stocks & Bond Brokers, Castro Valley
- Storage Trailers & Containers, Castro Valley
- Stoves & Furnace Equipment, Castro Valley - Fittings & Repair Parts
- Structural Engineer, Castro Valley
- Surgical Hospitals, Castro Valley - Surgical Centers
- Sushi Restaurants, Castro Valley
- Swimming Pools, Castro Valley
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Castro Valley
- Synagogues & Temples, Castro Valley
- Szechuan Restaurants, Castro Valley
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