There are 19 zip codes in Williamson County, Texas. The most populated is 78613, located in Cedar Park. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
78613Cedar Park88,189
78664Round Rock62,168
78665Round Rock61,640
78681Round Rock57,760
78628Georgetown41,428
78634Hutto41,099
78626Georgetown40,758
78717Austin34,499
78729Austin31,309
78633Georgetown27,292
78642Liberty Hill20,699
76574Taylor19,629
76537Jarrell11,501
76527Florence4,141
76530Granger2,424
78615Coupland1,781
76578Thrall1,232
78674Weir233
76573Schwertner27

Williamson County, Texas Zip Codes by Population (2024)