There are 7 zip codes in Hays County, Texas. The most populated is 78666, located in San Marcos. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
78666San Marcos86,530
78640Kyle68,265
78610Buda44,410
78737Austin24,951
78620Dripping Springs19,893
78676Wimberley15,321
78619Driftwood6,067

Hays County, Texas Zip Codes by Population (2024)