Old Round Rock, Texas ZIP Code - United States

The location Old Round Rock, TX has an unique ZIP Codes assigned (78664). Although this location name (Old Round Rock, TX) is set as NOT ACCEPTABLE (meaning it is an inadequate city name). So looking for the ZIP Code 78664 we have found out the following locations (for your mailing or form filling you should use an ACCEPTABLE or PRIMARY location name).

	City Name	ZIP Code	ZIP Type	Estimated Population
Round Rock, TX	PRIMARY	78664	STANDARD	42.720

Postal Zone of Old Round Rock, TX - USA

Old Round Rock, Texas ZIP Code - United States — ZIP Code Tabulation Areas (ZCTAs) for Old Round Rock, TX ZIP Code. A ZCTA is a generalized area representation of the american ZIP Code service area.

Old Round Rock, TX belongs to which county?

Old 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.