Popularity:#1 of 2 Post Offices in San Marcos#23 of 106 Post Offices in San Diego County#457 of 1,645 Post Offices in California#11,346 in Post Offices
View Address, Phone Number, and Hours for US Post Office, a Post Office, at North Twin Oaks Valley Road, San Marcos CA.
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The US Post Office, located in San Marcos, CA, is a branch location of the United States Postal Service (USPS) that serves the San Marcos community. The customer service postal facility offers mail and package delivery services, P.O. box services, and passport services. The USPS operates as an independent agency within the federal government, supported entirely by revenues generated through its operations.You may contact the Post Office for questions about: