List of US Post Office Stores in Santa Margarita, CA Outlet Note Regular Brands US Post Office California Santa Margarita Rating 4.5 based on 76 votes Official Website https://www.usps.com/ Products Postal Service NameAddressPhone Name/Address/Phone US Post Office outlet - Santa Margarita 22360 El Camino Real (805) 438-3950 People Also Viewed