| 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 | |
| Sledd, Michael | Deputy Public Works Director - Municipal Operations | Public Works | 949-644-3059 | |
| 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 | | |
| Smouse, Trevor | Management Analyst, Senior | Public Works | 949-644-3325 | |
| Snyder, Ryan | Recreation Leader, Senior | Recreation & Senior Services | | |
| Sodergren, Michael | Firefighter Paramedic 112 Hour (Before 1-1-2016) | Fire | 949-644-3355 | |
| Sommers, James | Transportation Manager/City Traffic Engineer | Public Works | 949-644-3326 | |
| Soto Valladolid, Barbara | Recreation Coordinator | Recreation & Senior Services | 949-718-1861 | |
