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 939th of 1798 cities in Post Offices per capita, and 839th of 1798 cities in Post Offices per square mile.
Find San Marcos, California post offices and USPS mailing boxes.
San Marcos Post Office 420 North Twin Oaks Valley Road San Marcos, CA
US Post Office 420 North Twin Oaks Valley Road San Marcos, CA
San Marcos Post Offices are branch locations of the customer service postal facilities of the United States Postal Service (USPS) in San Marcos, CA. The USPS is an independent agency of the federal government that provides mail and package delivery services to all states and territories. San Marcos post offices are supported entirely by revenues generated by their own operations. Operational authority over the USPS lies with a Board of Governors and rate setting authority falls under the Postal Rate Commission.You may contact the Post Office for questions about: