| Stoerck, Thomas | Harbor Services Worker | Harbor Department | 949-270-8159 | |
| Stocks, Nicholas | Fire Battalion Chief | Fire | 949-644-3363 | |
| Stinson, Mariah | Administrative Assistant | Recreation & Senior Services | 949-644-3158 | |
| Stefani, Parker | Recreation Leader, Senior | Recreation & Senior Services | | |
| Starn, Grady | Lifeguard II | Fire | | |
| Stansfield, Candice | Recreation Leader, Senior | Recreation & Senior Services | | |
| Stanley, Matthew | Harbor Services Worker, Lead | Harbor Department | 949-270-8159 | |
| Stairs, Cameron | Recreation Leader, Senior | Recreation & Senior Services | | |
| Stahl, Christopher | Recreation Leader, Senior | Recreation & Senior Services | | |
| Stadlman, Ryan | IT Analyst, Senior | City Manager | 949-644-3189 | |
| Stade, Strider | Lifeguard I | Fire | | |
| Stade, Sebastian | Lifeguard I | Fire | | |
| Spiker, Chad | Fire Staff Captain, Ems/Training | Fire | 949-644-3104 | |
| Speier, Elijah | Lifeguard II | Fire | | |
| Spangler, Linnea | Senior Pool Lifeguard | Recreation & Senior Services | | |
| Soto Valladolid, Felipe | Recreation Coordinator | Recreation & Senior Services | 949-644-3163 | |
| Soto Valladolid, Barbara | Recreation Coordinator | Recreation & Senior Services | 949-718-1861 | |
| Sodergren, Michael | Firefighter Paramedic 112 Hour (Before 1-1-2016) | Fire | 949-644-3355 | |
| Snyder, Ryan | Recreation Leader, Senior | Recreation & Senior Services | | |
| Smouse, Trevor | Management Analyst, Senior | Public Works | 949-644-3325 | |
