- Safety & Security Systems & Consultants, Brentwood
- Sandwich Shop Restaurants, Brentwood
- Satellite & Cable TV Equipment & Systems, Brentwood
- Satellite Dish Antennas & Equipment Dealers, Brentwood
- Sculptors, Brentwood
- Seafood Restaurants, Brentwood
- Search & Rescue, Brentwood
- Security & Surveillance System & Equipment, Brentwood
- Security Services, Brentwood
- Service Establishment Supplies & Equipment, Brentwood
- Sewer & Drain Cleaning & Repair, Brentwood - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Brentwood - Sewer Line, Pipe Installation & Repair Services
- Sheet Metal Contractors, Brentwood - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Brentwood
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- Shopping & Shopping Services, Brentwood
- Signs, Brentwood
- Social Services & Welfare, Brentwood
- Sound Systems Equipment Manufacturers, Brentwood
- Spare Rib Restaurants, Brentwood
- Specialty Animal Services, Brentwood
- Specialty Stores, Brentwood
- Sprinkler Alarm Systems, Brentwood - Fire Sprinkler Systems
- Stationery Engravers, Brentwood
- Steel Manufacturers, Brentwood
- Surgical Supplies & Equipment, Brentwood
- Surgical Supplies, Instruments, Tools & Equipment, Brentwood
- Synagogues & Temples, Brentwood
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