| Seitz, Tyler | Lifeguard I | Fire | | |
| Seo, Leah | Office Assistant | Public Works | 949-644-3331 | |
| Serbeniuk, Gary | Recreation Leader, Senior | Recreation & Senior Services | | |
| Setter, Gracie | Human Resources Specialist | Human Resources | 949-644-3304 | |
| Shaffer, Sterling | Contractor | Public Works | | |
| Shane, Samuel | Contractor | Public Works | | |
| Shank, David | Firefighter Paramedic 112 Hour (Before 1-1-2016) | Fire | 949-644-3104 | |
| Shapirshteyn, Bryan | Senior Pool Lifeguard | Recreation & Senior Services | | |
| Sharp, Porter | Lifeguard I | Fire | | |
| Shelton, Chad | Building Inspector II | Community Development | 949-644-3295 | |
| Sherman, Stuart | Library Clerk II | Library - City | 949-717-3856 | |
| 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 | |
