Austin-Round Rock-San Marcos, TX Metro Area
The Austin-Round Rock-San Marcos, TX metro area is made up of 5 counties in Texas: Travis, Williamson, Hays, Bastrop, and Caldwell, largest first. About 2,620,945 people lived there on July 1, 2025 (Census estimate), 14.8% more than in April 2020.
- Population, July 2025
- 2,620,945 14.8% more than in April 2020
- Type
- Metropolitan statistical area
- Counties
- 5: 3 central, 2 outlying
- Land area
- 4,220 sq mi (10,929 km²)
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- State
- Texas
- CBSA code
- 12420
Counties in the Austin-Round Rock-San Marcos, TX metro area, largest first
| County | Role | Population, July 2025 | Share of the area |
|---|---|---|---|
| Travis County | Central | 1,389,670 | 53.0% |
| Williamson County | Central | 752,827 | 28.7% |
| Hays County | Central | 304,390 | 11.6% |
| Bastrop County | Outlying | 118,908 | 4.5% |
| Caldwell County | Outlying | 55,150 | 2.1% |
A central county holds the area’s core, an urban area of at least 50,000 people. An outlying county is in the area because of commuting: at least a quarter of its workers have jobs in the central counties, or at least a quarter of the people working there live in them. A county belongs to one metro or micro area at most, and it counts whole, countryside included.
Principal cities, largest first
- Austin979,539 people
- Round Rock127,786 people
- Georgetown85,999 people
- San Marcos70,897 people
OMB names the area after its largest principal cities. A principal city is the area’s largest city, plus any other city that is very large or a big job center, and smaller ones with at least as many jobs as working residents (2020 Census and commuting figures). People counts are American Community Survey 2020–2024 5-year estimates.
Bordering metro and micro areas, nearest first
Areas with a county on this area’s edge. Distances are straight lines between the areas’ largest cities.
- Killeen-Temple, TX Metro Area54 mi north
- San Antonio-New Braunfels, TX Metro Area74 mi southwest
Before using this answer on a form
A metro or micro area is a statistical area that OMB draws for federal statistics. It is not a city, a local government or a mailing address, and it is not a measure of urban and rural: whole counties count, rural parts included. Programs that use metro areas, such as housing income limits or wage rates, can use their own version of these lists; check the program’s own list for an address.
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