There are 2 Post Offices in San Marcos, California, serving a population of 93,493 people in an area of 25 square miles. There is 1 Post Office per 46,746 people, and 1 Post Office per 12 square miles.
In California, San Marcos is ranked 1,086th of 1798 cities in Post Offices per capita, and 987th of 1798 cities in Post Offices per square mile.
Find addresses, phone numbers, fax numbers, hours & services for San Marcos Post Offices.
PostalAnnex+ Service Center #3002 711 Center Drive # 105 San Marcos, CA
United States Postal Service 420 North Twin Oaks Valley Road San Marcos, CA Mailing Service, Postal Services