How many people live in Williamson County, TX?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 727,500 people living in Williamson County, TX. That makes Williamson County the 12th-most populous county in Texas. It is home to 2.3% of people living in the state.
727K
population of Williamson County, TX (2024)
2.3%
County share of the Texas population (2024)
About 727,500 people lived in Williamson County, TX in 2024.
Population estimates, 2000–2024
What are Williamson County, TX’s age demographics?
About 95,900 Williamson County residents are aged 65 and older in 2024. That represents 13.2% of its population. For comparison, the age group represents 14% of Texas’s population and 18% in the US overall.
Another 169,700 Williamson County residents, or 23.3% of the population, were children under 18. For comparison, the age group represents 24.6% of Texas’s population and 21.6% in the US overall.
A higher share of Williamson County, TX's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Williamson County, TX’s racial and ethnic demographics?
Hispanic residents make up 25.2% of the Williamson County, TX population, higher than the national share of 20%. Williamson County, TX also has a larger share of people identifying as non-Hispanic Asian (12.7%) than the US overall (6.5%).
In contrast, Williamson County’s non-Hispanic white population accounts for 51.6%, below the 57.5% nationwide, and the non-Hispanic Black or African American population makes up 7.5% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Williamson County, TX has a higher share of a non-Hispanic white population than Texas as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Williamson County, TX is Round Rock with about 133,400 residents in 2024.
Cities and towns in Williamson County, TX ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Round Rock (pt.) | 133,441 |
| 2. | Georgetown | 101,344 |
| 3. | Leander (pt.) | 75,371 |
| 4. | Cedar Park (pt.) | 71,629 |
| 5. | Austin (pt.) | 70,212 |
| 6. | Hutto | 42,661 |
| 7. | Taylor | 17,872 |
| 8. | Liberty Hill | 11,984 |
| 9. | Jarrell | 5,151 |
| 10. | Florence | 1,211 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
