Round Rock, Texas ZIP Code - United States
The location Round Rock, TX has 6 differents ZIP Codes. Check the map below to check your ZIP Code.
| City Name | ZIP Code | ZIP Type | Estimated Population | |
|---|---|---|---|---|
| Round Rock, TX | PRIMARY  | 78664 | STANDARD | 42.720 |
| Round Rock, TX | PRIMARY | 78665 | STANDARD | 24.821 |
| Round Rock, TX | PRIMARY | 78680 | PO BOX | 1.106 |
| Round Rock, TX | PRIMARY | 78681 | STANDARD | 40.542 |
Postal Zone of Round Rock, TX - USA
Round Rock, TX belongs to which county?
Round Rock, TX belongs to Williamson county. Check the list of Williamson county ZIP Code.
ZIP Code Texas
Check the list of Texas ZIP Code.
ZIP Code United States
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Status Definitions
- PRIMARY: means an the primary city name. Official city name, although the city name might also have another acceptable name.
- ACCEPTABLE: means an adequate city name. City names that are abbreviated will frequently be listed as unacceptable because abbreviations are not an acceptable city name format.
- IMPROPER/NOT ACCEPTABLE: Means an inadequate city name has been entered or received based on information entered.
- UNIQUE: Assigned to a company, government agency, or entity with sufficient mail volume, based on average daily volume of letter size mail received, availability of ZIP Code numbers in the postal area, and the US mail service cost-benefit analysis.