ZIP Code 78667 is located in San Marcos Texas. 78667 is entirely within Hays County. Regionally, it is located in Metro Austin.
| ZIP Code Name | San Marcos |
| Primary County | Hays County |
| ZIP Code Type | PO Box |
| Current Time | CDT |
| Coordinates | 29.88430405,-97.94168854 |
| Adjacent ZIP Codes | |
| Region | Metro Austin |
| Metropolitan/Micropolitan Stat Area | Austin-Round Rock-Georgetown, TX |
| Time Zone | Central Daylight Time |
| IANA Timezone | America/Chicago |