Williamson County, Texas
Williamson County is a county in Texas. Its county FIPS code is 48491. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 48491
- Representative coordinates
- 30.649082, -97.605065
- County type
- County
- County seat or government
- Georgetown
- Resident population, July 2025
- 752,827
- Land area
- 2,890.088 km²
- Water area
- 41.477 km²
- State
- Texas
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Williamson County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
76511 · 76527 · 76530 · 76537 · 76573 · 76574 · 76577 · 76578 · 78613 · 78615 · 78621 · 78626 · 78628 · 78633 · 78634 · 78641 · 78642 · 78664 · 78665 · 78674 · 78681 · 78717 · 78727 · 78728 · 78729 · 78750 · 78759
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Austin city, Texas
- Bartlett city, TX
- Brushy Creek CDP, TX
- Cedar Park city, TX
- Coupland city, TX
- Florence city, TX
- Georgetown city, TX
- Granger city, TX
- Hutto city, TX
- Jarrell city, TX
- Leander city, TX
- Liberty Hill city, TX
- Pflugerville city, TX
- Round Rock city, TX
- Santa Rita Ranch CDP, TX
- Serenada CDP, TX
- Sonterra CDP, TX
- Taylor city, TX
- Thorndale city, TX
- Thrall city, TX
- Weir city, TX
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.