ZIP Code 78683 is located in Round Rock Texas. 78683 is entirely within Williamson County. Regionally, it is located in Metro Austin.
| ZIP Code Name | Round Rock |
| Primary County | Williamson County |
| ZIP Code Type | PO Box |
| Current Time | CDT |
| Coordinates | 30.49147987,-97.64517975 |
| Adjacent ZIP Codes | |
| Region | Metro Austin |
| Metropolitan/Micropolitan Stat Area | Austin-Round Rock-Georgetown, TX |
| Time Zone | Central Daylight Time |
| IANA Timezone | America/Chicago |