78642 Zip Code - Basic data & usps preferred city name. Web liberty hill, tx 78642. Web look up a zip code ™. Enter a corporate or residential street address, city, and state to see a specific. Web important zip code 78642 information. Web zip code 78642 is located in the county of williamson in the state of texas. 78642 zip code is spread between the coordinates of. Look up a zip code. Zip code 78642 is located in the city of liberty hill, texas and covers.
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