| Johnson, Karsten | Lifeguard II | Fire | | |
| Johnson, Jay | Lifeguard I | Fire | | |
| Johnson, Greg | Library Assistant | Library - City | 949-717-3808 | |
| Johnkins, Alexander | Librarian II | Library - City | 949-717-3840 | |
| John, Gabriel | Lifeguard II | Fire | | |
| Jette, Mark | Park Patrol Officer | Recreation & Senior Services | 949-795-2381 | |
| Jeremias, Stuart | Lifeguard I | Fire | | |
| Jen, Benjamin | Permit Technician II | Community Development | 949-644-3274 | |
| Jeffs, Charles | Lifeguard I | Fire | | |
| Jawhary, Amanda | Management Analyst, Assistant | Community Development | 949-644-3398 | |
| Jasso, Rosa | Paralegal | City Attorney | 949-644-3191 | |
| Jardim, Caden | Lifeguard I | Fire | | |
| Janis, Joseph | Fire Staff Captain, Ems/Training | Fire | 949-644-3104 | |
| Janda, Anna | Senior Pool Lifeguard | Recreation & Senior Services | | |
| Jameson, Tyler | Senior Pool Lifeguard | Recreation & Senior Services | | |
| Jalandoni, Nathan | Recreation Leader, Senior | Recreation & Senior Services | | |
| Jacome, Sully | Library Assistant | Library - City | 949-717-3838 | |
| Jacome, Nicholas | Intern | Community Development | | |
| Jacome, Francine | Administrative Assistant | Library - City | 949-717-3809 | |
| Jacob, Jericho | Recreation Leader, Senior | Recreation & Senior Services | | |
