| Official Zip Code Name | San Marcos |
| Zip Code State | Texas |
| Primary County: | Hays |
| Area Code | 512/737 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 6 |
| Elevation Range | 616 ft. |
| Area | 0 Sqm. |
| Coordinates(Y,X) | 29.883400, -97.941200 |