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
Population
City
7861388,189Cedar Park
7864187,106Leander
7866462,168Round Rock
7868157,760Round Rock
7862841,428Georgetown
7863441,099Hutto
7862640,758Georgetown
7871734,499Austin
7872931,309Austin
7863327,292Georgetown
7864220,699Liberty Hill
7657419,629Taylor
7653711,501Jarrell
765274,141Florence
765302,424Granger
786151,781Coupland
765781,232Thrall
78674233Weir
7657327Schwertner
showing: 19 rows

Zip Codes in Williamson County, Texas by Population (2024)