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What county is Austin, TX in?

Updated · Data: U.S. Census Bureau

Austin, Texas is in 2 counties. Most residents (93.4%) live in the Travis County part; the rest live in Williamson County. Austin mailing addresses (ZIP codes named Austin) also reach Hays County, so check your street.

Which counties do Austin residents live in?

CountyShare of residentsChart
Travis County93.4% (903,914 people)
Williamson County6.5% (63,149 people)

How is Austin's land split between counties?

CountyShare of land areaChart
Travis County91.9%
Williamson County6.3%
Hays County1.8%

Inside Austin, the county depends on the address: check your address privately. See all Texas cities in more than one county or look up another city.

Austin at a glance

Population967,862Largest place in Travis County
Land area326.4 sq mi2,965 people per sq mi
Share of Travis County69%of the county's residents live here
County seatYes
Time zoneCentralAmerica/Chicago

What ZIP codes are in Austin?

74 ZIP codes use the name Austin or are centered in it. Shares are of each ZIP's land; a ZIP named after a town can reach beyond its city limits.

ZIPPost office nameCounty (land share)
73301AustinTravis County
73344AustinTravis County
78701AustinTravis County
78702AustinTravis County
78703AustinTravis County
78704AustinTravis County
78705AustinTravis County
78708AustinTravis County
78709AustinTravis County
78710AustinTravis County
78711AustinTravis County
78712AustinTravis County
78713AustinTravis County
78714AustinTravis County
78715AustinTravis County
78716AustinTravis County
78717AustinWilliamson County
78718AustinTravis County
78719AustinTravis County
78720AustinTravis County
78721AustinTravis County
78722AustinTravis County
78723AustinTravis County
78724AustinTravis County
78725AustinTravis County
78726AustinTravis County
78727AustinTravis County 98%, Williamson County 2%
78728AustinTravis County 78%, Williamson County 22%
78729AustinWilliamson County 88%, Travis County 12%
78730AustinTravis County
78731AustinTravis County
78732AustinTravis County
78733AustinTravis County
78734AustinTravis County
78735AustinTravis County
78736AustinTravis County 97%, Hays County 3%
78737AustinHays County 71%, Travis County 29%
78738AustinTravis County
78739AustinTravis County 92%, Hays County 8%
78741AustinTravis County
78742AustinTravis County
78744AustinTravis County
78745AustinTravis County
78746AustinTravis County
78747AustinTravis County
78748AustinTravis County
78749AustinTravis County
78750AustinTravis County 78%, Williamson County 22%
78751AustinTravis County
78752AustinTravis County
78753AustinTravis County
78754AustinTravis County
78755AustinTravis County
78756AustinTravis County
78757AustinTravis County
78758AustinTravis County
78759AustinTravis County 99%, Williamson County 1%
78760AustinTravis County
78761AustinTravis County
78762AustinTravis County
78763AustinTravis County
78764AustinTravis County
78765AustinTravis County
78766AustinTravis County
78767AustinTravis County
78768AustinTravis County
78769AustinTravis County
78772AustinTravis County
78773AustinTravis County
78774AustinTravis County
78778AustinTravis County
78779AustinTravis County
78783AustinTravis County
78799AustinTravis County

About Travis County

County seat: Austin. FIPS code 48453. Population 1,307,625. All Travis County facts.

Towns near Austin

  • Rollingwood: 2.6 mi away, Travis County
  • West Lake Hills: 3.6 mi away, Travis County
  • Lost Creek: 5.7 mi away, Travis County
  • Barton Creek: 7.0 mi away, Travis County
  • Steiner Ranch: 9.6 mi away, Travis County
  • Hornsby Bend: 11 mi away, Travis County

Austin has about 967,862 people. It is an incorporated city or town.

Sources: ACS 2019-2023 5-year (residents by county, table B01003); Census TIGER/Line 2024 and Gazetteer 2024 (land, location); Census 2020 ZCTA file and GeoNames (ZIP codes). Data as of November 1, 2026. Not affiliated with any government agency.

FAQ

Frequently asked questions

What county is Austin, TX in?
Austin, Texas is in 2 counties. Most residents (93.4%) live in the Travis County part; the rest live in Williamson County. Austin mailing addresses (ZIP codes named Austin) also reach Hays County, so check your street. The county seat of Travis County is Austin.
Is Austin in more than one county?
Yes. 2 counties: Travis County (93.4% of residents), Williamson County (6.5% of residents).
What ZIP codes are in Austin, TX?
73301, 73344, 78701, 78702, 78703, 78704, 78705, 78708, 78709, 78710, 78711, 78712, 78713, 78714, 78715, 78716, 78717, 78718, 78719, 78720, 78721, 78722, 78723, 78724, 78725, 78726, 78727, 78728, 78729, 78730, 78731, 78732, 78733, 78734, 78735, 78736, 78737, 78738, 78739, 78741, 78742, 78744, 78745, 78746, 78747, 78748, 78749, 78750, 78751, 78752, 78753, 78754, 78755, 78756, 78757, 78758, 78759, 78760, 78761, 78762, 78763, 78764, 78765, 78766, 78767, 78768, 78769, 78772, 78773, 78774, 78778, 78779, 78783, 78799.
Is Austin the county seat of Travis County?
Yes.
What time zone is Austin, TX in?
Central time (America/Chicago).
How do I know which county my Austin address is in?
Use the address lookup at your home, or check your appraisal district record.

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