| Post Office | Zip / * | Established | first pre- cancels autho- rized | Discontinued | Notes |
| Anderson's Mills (1876-1884) * | town originally in Travis County only, now Anderson Mill CDP (Census Designated Place) in Travis-Williamson Counties with no Post Office of that name. |
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| AUSTIN | city in Travis-Williamson Counties, Post Office in Travis County, check branches |
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| BARTLETT | post office originally established in Williamson County, moved to Bell County, city in Bell-Williamson Counties |
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| CEDAR PARK | 78613 | | yes | operating | city in Williamson-Travis Counties, post office in Williamson County, 500 E Whitestone Blvd, M-F 8-5 Sat 9-12, 512-260-7585 |
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| COUPLAND | 78615 | | yes | operating | new building c2002 |
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| FLORENCE | 76527 | | yes | operating | |
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| GEORGETOWN | 78626 | | yes | operating | |
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| GRANGER | 76530 | | yes | operating | |
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| HUTTO | 78634 | | yes | operating | |
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| JARRELL | 76537 | | none | operating | town rebuilt after being totally destroyed by F5 tornado in 1997 |
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| LEANDER | 78641 | | yes | operating | city in Williamson-Travis Counties, post office in Williamson County |
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| LIBERTY HILL | 78642 | | none | operating | |
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| PFLUGERVILLE | city in Travis-Williamson Counties, post office in Travis County |
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| ROUND ROCK | 78664 | | yes | operating | city in Williamson-Travis Counties, post office in Williamson County, Frontier Main Office, 2250 Double Creek Dr, M-F 7:30-4:30 Sat 8:30-1, 512-244-6432 |
| ROUND ROCK | 78681 | | | operating | West, 797 Sam Bass Rd, M-F 8-5 Sat 8:30-12, (512)238-9461 |
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| SCHWERTNER | 76573 | | none | operating | |
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| TAYLOR | 76574 | | yes | operating | |
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| THORNDALE | city in Milam-Williamson Counties, post office in Milam County |
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| THRALL | 76578 | | none | operating | |
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| WALBURG | 78673 | | none | operating | |
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| WEIR | 78674 | | none | operating | |
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