ZIP CodesZIP codes in Williamson County, Texas
Williamson County, Texas has 27 ZIP codes in this list, from 76527 to 78729. They cover 16 places, among them Round Rock, Georgetown, Cedar Park and Leander.
Nothing in this county matches.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 76527 | Florence | 120 | 30.808, -97.781 |
| 76530 | Granger | 92.3 | 30.740, -97.445 |
| 76537 | Jarrell | 53.7 | 30.812, -97.594 |
| 76573 | Schwertner | 0.9 | 30.816, -97.514 |
| 76574 | Taylor | 149 | 30.571, -97.409 |
| 76578 | Thrall | 65.2 | 30.592, -97.289 |
| 78613 | Cedar Park | 27.7 | 30.505, -97.820 |
| 78615 | Coupland | 54.5 | 30.487, -97.368 |
| 78626 | Georgetown | 88.6 | 30.633, -97.671 |
| 78627 | Georgetown | no area | 30.633, -97.677 |
| 78628 | Georgetown | 64.7 | 30.641, -97.751 |
| 78630 | Cedar Park | no area | 30.505, -97.820 |
| 78633 | Georgetown | 78.5 | 30.718, -97.754 |
| 78634 | Hutto | 56.4 | 30.526, -97.567 |
| 78641 | Leander | 124 | 30.584, -97.858 |
| 78642 | Liberty Hill | 111 | 30.663, -97.932 |
| 78646 | Leander | no area | 30.579, -97.853 |
| 78664 | Round Rock | 16.6 | 30.515, -97.668 |
| 78665 | Round Rock | 24.1 | 30.515, -97.668 |
| 78673 | Walburg | no area | 30.741, -97.589 |
| 78674 | Weir | 0.4 | 30.675, -97.593 |
| 78680 | Round Rock | no area | 30.657, -97.603 |
| 78681 | Round Rock | 23.2 | 30.508, -97.679 |
| 78682 | Round Rock | no area | 30.657, -97.603 |
| 78683 | Round Rock | no area | 30.657, -97.603 |
| 78717 | Austin | 13.0 | 30.506, -97.747 |
| 78729 | Austin | 9.8 | 30.452, -97.769 |
The ZIP code areas of Williamson County add up to about 1,174 square miles of land (3,039 sq km) as the Census Bureau draws them. The largest is 76574 (Taylor), with 149 square miles.
Places with more than one code here: Round Rock (6 codes), Georgetown (4 codes), Cedar Park (2 codes).
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Florence, TX 76527.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.