Round Rock zip code

Zip code in Round Rock, TX

The location Round Rock belongs to Williamson County, state of Texas. Round Rock has 6 zip codes which you can see in the following table.

Round Rock is the official name of the location so if you want to use the US Postal Service you must use that name.

Zip code	Type	Population
78664	STANDARD	54,060
78665	STANDARD	54,040
78680	PO BOX	1,062
78681	STANDARD	54,030
78682	UNIQUE	46
78683	PO BOX	665

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