San Marcos, TX ZIP Codes & Directory
San Marcos is an incorporated city in Hays County, Texas. Browse all active 5-digit USPS postal codes serving San Marcos and surrounding Hays County delivery districts.
All ZIP Codes in San Marcos, TX
1 CodesAbout San Marcos Mail Delivery & Postal Administration
ZIP codes in San Marcos are administered by the United States Postal Service. Delivery routes are coordinated through regional Sectional Center Facilities (SCFs) servicing Hays County and surrounding Texas metropolitan districts.
Frequently Asked Questions About San Marcos, TX ZIP Codes
How many ZIP codes serve San Marcos, Texas? ▾
San Marcos, Texas is served by 1 active USPS postal delivery codes: 78666.
What county is San Marcos located in? ▾
San Marcos is an incorporated city located within Hays County, Texas.
What is the population and demographic size of San Marcos? ▾
According to U.S. Census Bureau data, San Marcos has an estimated population of 67,553 residents and is situated within the Greater Austin.
How does mail sorting and delivery work in San Marcos? ▾
Mail delivery in San Marcos is operated by the United States Postal Service through regional Sectional Center Facility (SCF) distribution plants servicing Hays County and surrounding Texas counties.