| Avila, Beatriz | Office Assistant | Recreation & Senior Services | | |
| Aune, Tor | Lifeguard I | Fire | | |
| Auger, Michael | Public Works Supervisor | Public Works | 949-718-3463 | |
| Auger, Craig | Utilities Supervisor | Utilities | 949-718-3481 | |
| Auger, Christian | Utilities Supervisor | Utilities | 949-644-3019 | |
| Aube, Kyle | Civil Engineer, Associate | Public Works | 949-644-3296 | |
| Asato, Natalie | Human Resources Analyst, Senior | Human Resources | 949-270-8141 | |
| Arroyo, Britney | Recreation Coordinator, Assistant | Recreation & Senior Services | | |
| Arregui, Gerardo | Planner, Assistant | Community Development | 949-644-3249 | |
| Arnett, Chelsea | Department Assistant | Fire | 949-644-3175 | |
| Armas, Cesar | Recreation Supervisor | Recreation & Senior Services | 949-270-8109 | |
| Arellano, Tosha | Human Resources Analyst, Senior | Human Resources | 949-644-3337 | |
| Arechiga-Camacho, Sonia | Fiscal Clerk, Senior | Finance | 949-644-3137 | |
| Arechiga, Samuel | Maintenance Operator | Public Works | 949-718-3463 | |
| Arciniega, Elizabeth | Recreation Coordinator | Recreation & Senior Services | 949-718-1828 | |
| Aquino, Dan | Civil Engineer - Plan Check, Principal | Community Development | 949-644-3292 | |
| Appeldorn, Gavin | Senior Pool Lifeguard | Recreation & Senior Services | | |
| Appeldorn, Fletcher | Senior Pool Lifeguard | Recreation & Senior Services | | |
| Aniol, Hali | Fiscal Clerk, Senior | Finance | 949-644-3248 | |
| Angeloff, Anne-Marie | Library Assistant | Library - City | 949-717-3861 | |
