| Andersen, Leonard | Facilities Maintenance Worker II | Recreation | | |
| Anderson, Bryce | Firefighter Paramedic 112 Hour | Fire | 949-644-3355 | |
| Anderson, Matthew | Fire Engineer 112 Hour | Fire | 949-644-3355 | |
| Aquino, Dan | Civil Engineer - Plan Check | Community Development | 949-644-3292 | |
| Arciniega, Elizabeth | Recreation Coordinator | Recreation | 949-718-1828 | |
| Arciniega, Patrick | Civil Engineer, Senior | Public Works | 949-644-3347 | |
| Arechiga, Samuel | Maintenance Worker II | Public Works Municipal Operations | 949-718-3463 | |
| Arechiga-Camacho, Sonia | Fiscal Clerk, Senior | Finance | 949-644-3137 | |
| Arellano, Tosha | Human Resources Specialist II | Human Resources | 949-644-3337 | |
| Argersinger, Samuel | Lifeguard I | Fire | | |
| Armas, Cesar | Recreation Coordinator | Recreation | 949-644-8150 | |
| Armstrong, Kip | Lifeguard II | Fire | | |
| Arnett, Chelsea | Department Assistant | Fire | 949-644-3175 | |
| Asato, Natalie | Human Resources Specialist I (HRis) | Human Resources | 949-270-8141 | |
| Atherton, Sarah | Department Assistant | Library - City | 949-717-3874 | |
| Auger, Christian | Utilities Supervisor | Utilities | 949-644-3019 | |
| Auger, Craig | Utilities Supervisor | Utilities | 949-718-3481 | |
| Auger, Michael | Public Works Supervisor | Public Works Municipal Operations | 949-718-3463 | |
| Avalos, Ashley | Recreation Leader, Senior | Recreation | | |
| Avila, Beatriz | Recreation Leader, Senior | Recreation | | |
