Round Rock zipcode
| City | Round Rock |
| ZIP Code | 78664 |
| Type | Standard |
| State Code | TX |
| State | Texas |
ZIP code of Round Rock is 78664. This place is located in Texas state in US. To send any postal service to Round Rock, you must use 78664 zipcode.
You should avoid following 2 city names of Texas to be used with the ZIP code 78664.
- Old Round Rock, TX
- Three Point, TX