Data Last Updated: March 1, 2023

ZIP Codes for City of Round Rock, TX


    
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Counties:	WILLIAMSON, TX
Area Code(s):	512, 737
Timezone(s):	Central (GMT -06:00)
City Population:	99,887 (More Details)
CBSA:	Austin-Round Rock-Georgetown, TX
Congressional District(s):	10, 17, 31
Land Area:	1,118 square miles (county)
Water Area:	16 square miles (county)

6 ZIP Codes

Round Rock, TX ZIP Code Boundaries

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Round Rock, TX Covers 6 ZIP Codes

ZIP Code	Type	Population	% of Population	Aliases
78664	Standard	52,932	37.94%	OLD ROUND ROCK, THREE POINT
78665	Standard	35,985	25.79%
78680	P.O. Box	0	0.00%
78681	Standard	50,606	36.27%	AUSTIN
78682	Unique	0	0.00%	DELL COMPUTERS
78683	P.O. Box	0	0.00%

Round Rock, TX Demographic Information *

Total population**	99,887
Male population	49,139
Female population	50,748
Median age (years)	32
White Population	70,707
Black Population	9,744
Indian Population	678
Asian Population	5,165
Hawaiian Population	124
Hispanic Population	28,958
Median age (Male)	31.2
Median age (Female)	32.6
Total households	35,050
Family households (families)	25,587
Average household size	2.84
Average family size	3.32
Total housing units	37,223

* Demographic data is based on 2010 Census for the City of ROUND ROCK.
** City and ZIP Code Population will not be equal due to differences in their geographies.

References

U.S. Postal Service [Last Updated: 2/1/2023], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 2/1/2023], https://www.zip-codes.com
U.S. Geological Survey [Updated as needed], https://www.usgs.gov/
U.S. Census [Updated Yearly], https://www.census.gov
U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010], https://www.census.gov