Post Offices and USPS-authorized retailers where postage stamps are sold in San Marcos, CA.
All the locations below sell USPS postage stamps which can be used to mail First Class letters in the United States. We list both official post offices run by the United States Postal Service and retailers which have been authorized by USPS to sell postal products in San Marcos.
Need to mail a letter? See Mailboxes and Post Offices in San Marcos