| Shintaku, Cynthia | Administrative Assistant | Harbor Department | | |
| Shook, Travis | Fire Engineer 112 Hour | Fire | 949-644-3104 | |
| Shrader, Ariel | Library Assistant | Library - City | 949-717-3861 | |
| Shumway, Lena | City Clerk | City Clerk | 949-644-3005 | |
| Silva, Robert | Construction Inspection Supervisor | Public Works | 949-270-8131 | |
| Simpson, Cooper | Lifeguard II | Fire | | |
| Sinacori, Georgia | Senior Pool Lifeguard | Recreation & Senior Services | | |
| Sinacori, Lorelai | Recreation Coordinator, Assistant | Recreation & Senior Services | | |
| Sinacori, Michael | Assistant City Engineer | Public Works | 949-644-3342 | |
| Sinclair, Robert | Lifeguard II | Fire | | |
| Skarin, Eric | Civil Engineer - Plan Check, Senior | Community Development | 949-644-3270 | |
| Skelly, Matthew | Fire Engineer 112 Hour | Fire | 949-644-3355 | |
| Smith, Annika | Recreation Leader, Senior | Recreation & Senior Services | | |
| Smith, Benjamin | Lifeguard Cadet | Fire | | |
| Smith, Braden | Lifeguard I | Fire | | |
| Smith, Christina | Literacy Coordinator | Library - City | 949-717-3874 | |
| Smith, Eric | Lifeguard III | Fire | | |
| Smith, Riley | Recreation Leader, Senior | Recreation & Senior Services | | |
| Smith, Trent | Lifeguard I | Fire | | |
| Smith, Troy | Lifeguard I | Fire | | |
