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ZIP Code Database - Facts & Stats

Data Last Updated: March 1, 2023

ZIP Codes for City of Round Rock, TX

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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 CodeTypePopulation% of PopulationAliases
78664Standard52,93237.94%OLD ROUND ROCK, THREE POINT
78680P.O. Box00.00%
78682Unique00.00%DELL COMPUTERS
78683P.O. Box00.00%

Round Rock, TX Demographic Information *

Total population**99,887
Male population49,139
Female population50,748
Median age (years)32
White Population70,707
Black Population9,744
Indian Population678
Asian Population5,165
Hawaiian Population124
Hispanic Population28,958
Median age (Male)31.2
Median age (Female)32.6
Total households35,050
Family households (families)25,587
Average household size2.84
Average family size3.32
Total housing units37,223
* 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.


  1. U.S. Postal Service [Last Updated: 2/1/2023],
  2. Internal Data Creation [Last Updated: 2/1/2023],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],