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.
Zip Code | Population | City |
|---|---|---|
| 78613 | 88,189 | Cedar Park |
| 78664 | 62,168 | Round Rock |
| 78665 | 61,640 | Round Rock |
| 78681 | 57,760 | Round Rock |
| 78628 | 41,428 | Georgetown |
| 78634 | 41,099 | Hutto |
| 78626 | 40,758 | Georgetown |
| 78717 | 34,499 | Austin |
| 78729 | 31,309 | Austin |
| 78633 | 27,292 | Georgetown |
| 78642 | 20,699 | Liberty Hill |
| 76574 | 19,629 | Taylor |
| 76537 | 11,501 | Jarrell |
| 76527 | 4,141 | Florence |
| 76530 | 2,424 | Granger |
| 78615 | 1,781 | Coupland |
| 76578 | 1,232 | Thrall |
| 78674 | 233 | Weir |
| 76573 | 27 | Schwertner |