Texas · Census place 4863500
Round Rock, Texas
Round Rock is a city in 2 counties of Texas with an estimated 135,359 residents on July 1, 2024. It is the 28th largest of 804 incorporated places of 1,000+ people in the state.
- Population 2024
- 135,359
- #28 of 804 in Texas
- Change since 2020
- +12.3%
- +14,787 people
- Land area
- 38.1 sq mi
- + 0.36 sq mi water
- Density
- 3,549 / sq mi
- State median 1,561
Measure from here
Tools and pages that start from Round Rock
Round Rock population, 2020 to 2024
Round Rock added 14,787 residents from July 2020 to July 2024, a change of +12.3%. In the latest year it moved by +4,043. Among 384 Texas places of 5,000 or more, that growth ranks 104th; the median place changed by +4.5%. The median place of 5,000+ in Texas has 15,345 people, so Round Rock is 8.8 times that size.
Round Rock covers 38.14 square miles of land and 0.36 of water, for 3,549 people per square mile of land. The median Texas place of 5,000+ has 1,561, so Round Rock is denser than the typical town.
The 2 counties Round Rock spans
Round Rock crosses county lines. The Census county-part estimates split its 135,359 residents as follows; Williamson County holds 98.6% of them. The shaded shapes are on the map above; dots mark the eight nearest places.
- 01Williamson County133,441
- 02Travis County1,918
ZIP codes in Round Rock
3 ZIP Code Tabulation Areas (ZCTAs) overlap Round Rock by at least 10% of the ZCTA's or the city's land: 78664, 78665, 78681. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.
Where Round Rock is
The Census internal point of Round Rock is at 30.526100, -97.663500. Austin, the capital, is 18.0 miles SSW in a straight line. The nearest larger place is Austin, TX (993,588 people), 16.6 miles away. The nearest city of 100,000 or more is Georgetown, TX, 10.0 miles away. The ground at the internal point is about 226 m (741 ft) above sea level.
Internal point
- Decimal
- 30.526100, -97.663500
- DMS
- 30°31'33.96"N 97°39'48.60"W
- UTM
- 14N 628222.7E 3377843.5N
- Geohash
- 9v6t9t5e7
- Plus code
- 8624G8GP+CJ
- Time zone
- America/Chicago
Daylight in Round Rock
At 30.53° N, Round Rock gets about 14 h 07 min of daylight around the June solstice and 10 h 10 min around the December solstice, a swing of 3 h 57 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026. Month-by-month sunrise and sunset times are on the Round Rock daylight page.
Places near Round Rock
The eight nearest incorporated places of 1,000+ in Texas, measured between internal points. The closest is Pflugerville, 6.5 miles away, with 66,819 people.
Questions people ask
What is the population of Round Rock, TX?
135,359 on July 1, 2024, in the Census Vintage 2024 estimates. That is up 14,787 (12.3%) from 120,572 in July 2020.
What county is Round Rock in?
It spans 2 counties: Williamson County (133,441 residents), Travis County (1,918 residents).
What ZIP codes cover Round Rock?
3 ZIP Code Tabulation Areas overlap it by at least 10% of either area: 78664, 78665, 78681.
How far is Round Rock from Austin?
18.0 miles (29.0 km) in a straight line, heading SSW from Round Rock.
What is the nearest larger city to Round Rock?
Austin, TX, with 993,588 residents, 16.6 miles away between internal points.
Sources and data as of
Data as of: Census Vintage 2024 subcounty estimates (July 1, 2024), 2024 Gazetteer places, 2020 ZCTA to place relationship file.
- 01Census Vintage 2024 subcounty population estimates
- 02Census 2024 Gazetteer, places
- 03Census 2020 ZCTA to place relationship file
- 04Census 2024 cartographic boundary file, counties (1:5,000,000)
- 05Open-Meteo forecast API (time zone and Copernicus GLO-90 elevation) (last verified 2026-09-30)
How every number is computed: methodology. Spotted a wrong figure? Report an error.