San Marcos ZIP Codes

List of Zip Codes of San Marcos

The following table lists ZIP Codes associated with San Marcos, Texas, based on ZIP Code Tabulation Area (ZCTA) data from the U.S. Census Bureau.


S.N. Zip Code Latitude Longitude County Population Density
1 78666 29.8826 -97.97974 Hays 87,775 176.2


About San Marcos Texas Zip Codes

The city of San Marcos in Texas (TX) is served by approximately 1 ZIP Codes. These codes cover residential neighborhoods, business districts, and surrounding localities that use the city name in their mailing address.

Based on ZIP-level population estimates, the combined population covered by these ZIP Codes is around 87,775 people. Population density can vary significantly from one ZIP Code to another, reflecting the mix of dense urban blocks, commercial corridors, and lower-density residential areas.

The ZIP Codes associated with San Marcos fall within county jurisdictions such as Hays. Each county manages local services, land use, and administration for the areas corresponding to its ZIP Codes.

Most ZIP codes for San Marcos, Texas follow the America/Chicago time zone.