ZIP codes in Round Rock, Texas
Round Rock has 6 ZIP codes in this directory. Each ZIP is listed with its county, population and time zone.
| ZIP | County | Population | Time zone |
|---|---|---|---|
| 78664 | Williamson | 115,997 | America/Chicago |
| 78665 | Williamson | 115,997 | America/Chicago |
| 78680 | Williamson | 115,997 | America/Chicago |
| 78681 | Williamson | 115,997 | America/Chicago |
| 78682 | Williamson | 115,997 | America/Chicago |
| 78683 | Williamson | 115,997 | America/Chicago |
About Round Rock ZIP codes
ZIP codes in Round Rock are part of the USPS delivery network for Texas. The codes above are ordered numerically; each links to a page with coordinates, nearby ZIPs and more detail. Population shown is the estimated population of the city: 115,997.