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
Round Rock, TX	PRIMARY	78682	UNIQUE	0
Round Rock, TX	PRIMARY	78683	PO BOX	629

Postal Zone of Round Rock, TX - USA

Round Rock, TX belongs to Williamson county. Check the list of Williamson county ZIP Code.

Check the list of Texas ZIP Code.

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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.