Williamson County, Texas ZIP codes
26 ZIP codes are in Williamson County, plus 8 that cross in from neighboring counties. It's part of the Austin-Round Rock-San Marcos, TX metro area.
- ZIP codes
- 26
- Population in these ZIPs
- 591,187
- Avg. median income
- $114,800population-weighted
- Cities & towns
- 16
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Williamson County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 76527 | Florence | 4,918 | $81,574 | $529,800 |
| 76530 | Granger | 2,598 | $106,250 | $310,700 |
| 76537 | Jarrell | 16,272 | $98,199 | $250,900 |
| 76573 | Schwertner | 0 | — | — |
| 76574 | Taylor | 20,242 | $78,568 | $276,800 |
| 76578 | Thrall | 1,762 | $105,063 | $362,800 |
| 78613 | Cedar Park | 89,956 | $125,487 | $451,800 |
| 78615 | Coupland | 1,637 | $80,938 | $528,500 |
| 78626 | Georgetown | 48,072 | $100,431 | $343,600 |
| 78627 PO Box | Georgetown | — | — | — |
| 78628 | Georgetown | 50,822 | $125,635 | $469,000 |
| 78630 PO Box | Cedar Park | — | — | — |
| 78633 | Georgetown | 29,309 | $100,936 | $435,900 |
| 78634 | Hutto | 46,413 | $114,426 | $328,000 |
| 78642 | Liberty Hill | 26,434 | $132,958 | $485,700 |
| 78646 PO Box | Leander | — | — | — |
| 78664 | Round Rock | 62,060 | $87,417 | $327,600 |
| 78665 | Round Rock | 66,171 | $122,680 | $390,300 |
| 78673 PO Box | Walburg | — | — | — |
| 78674 | Weir | 108 | — | $47,500 |
| 78680 PO Box | Round Rock | — | — | — |
| 78681 | Round Rock | 56,691 | $137,819 | $473,200 |
| 78682 PO Box | Round Rock | — | — | — |
| 78683 PO Box | Round Rock | — | — | — |
| 78717 | Austin | 37,262 | $145,325 | $548,400 |
| 78729 | Austin | 30,460 | $86,438 | $419,900 |
ZIP codes partly in Williamson County
These ZIP codes are mostly in a neighboring county but cover part of Williamson County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 76511 | Bartlett | Bell County | 2,702 | $69,286 | $215,200 |
| 76577 | Thorndale | Milam County | 3,128 | $64,107 | $388,300 |
| 78621 | Elgin | Bastrop County | 30,411 | $98,534 | $285,100 |
| 78641 | Leander | Travis County | 99,865 | $135,024 | $425,300 |
| 78727 | Austin | Travis County | 29,958 | $110,379 | $442,800 |
| 78728 | Austin | Travis County | 26,777 | $75,243 | $392,400 |
| 78750 | Austin | Travis County | 29,277 | $121,563 | $587,900 |
| 78759 | Austin | Travis County | 43,182 | $102,400 | $644,600 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Williamson County
Nearby counties
Frequently asked questions
How many ZIP codes are in Williamson County, Texas?
26 ZIP codes are mainly in Williamson County, and 8 more ZIP codes from neighboring areas reach partly into it.
What cities are in Williamson County?
ZIP codes in Williamson County use the city names Austin, Cedar Park, Coupland, Florence, Georgetown, Granger, Hutto, Jarrell, Leander, Liberty Hill, Round Rock and Schwertner and others.
What metro area is Williamson County in?
Williamson County is part of the Austin-Round Rock-San Marcos, TX metropolitan statistical area.