Old Round Rock zip code
Zip code in Old Round Rock, TX
The location Old Round Rock belongs to Williamson County, state of Texas. Old Round Rock has been assigned with the zip code 78664.
The location name Old Round Rock is listed as unacceptable by the US Postal Service so any mailing should avoid it. Instead you can use Round Rock, the official name of the location.
| Zip code | Type | Population |
|---|---|---|
| 78664 | STANDARD | 54,060 |
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