- Scientific & Laboratory Equipment & Instruments, Alton
- Scrap & Waste Materials, Alton
- Seafood Restaurants, Alton
- Security & Surveillance System & Equipment, Alton
- Security Guard & Patrol Service, Alton - Bodyguard, Guard Dogs, Etc
- Security Services, Alton
- Septic Tanks & Septic Systems Contractors, Alton - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems Inspection, Alton
- Shopping & Shopping Services, Alton
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