Post Offices List in Rancho Santa Margarita City, California:
| Rancho Santa Margarita Post Office | 29862 Avenida De Las Bandera, Rancho Santa Margarita, CA 92688 |
| Rancho Post Office | 29851 Aventura Ste K, Rancho Santa Margarita, CA 92688 |
| Rancho Santa Margarita Post Office | 29862 Avenida De Las Bandera, Rancho Santa Margarita, CA 92688 |
| Rancho Post Office | 29851 Aventura Ste K, Rancho Santa Margarita, CA 92688 |