| Arnett, Chelsea | Department Assistant | Fire | 949-644-3175 | |
| Arregui, Gerardo | Planner, Assistant | Community Development | 949-644-3249 | |
| Arroyo, Britney | Recreation Coordinator, Assistant | Recreation & Senior Services | | |
| Asato, Natalie | Human Resources Analyst, Senior | Human Resources | 949-270-8141 | |
| Atwood, Ethan | Firefighter Paramedic 112 Hour (On Or After 1-1-2016) | Fire | 949-644-3113 | |
| Aube, Kyle | Civil Engineer, Associate | Public Works | 949-644-3296 | |
| Auger, Christian | Utilities Supervisor | Utilities | 949-644-3019 | |
| Auger, Craig | Utilities Supervisor | Utilities | 949-718-3481 | |
| Aune, Tor | Lifeguard I | Fire | | |
| Avalos, Jessele | Recreation Leader, Senior | Recreation & Senior Services | | |
| Avila, Beatriz | Department Assistant | Community Development | 949-644-3293 | |
| Avila, Jasmin | Librarian I | Library - City | 949-717-3824 | |
| Avila, Miguel | Contractor | Public Works | | |
| Aziz, George | Contractor | Public Works | | |
