Williamson County, Texas Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 12th-largest in Texas
The population of Williamson County, Texas is 643,889 as of the 2023 American Community Survey, making it the 12th-largest county in Texas. The median household income is $108,309, the median home value is $414,600, and the median age is 37.2.
The population of Williamson County has grown 70.5% since 2010 (426,568 → 727,480), a +3.89% annualized rate.
643,889
Population
+3.89%
Annual growth
577
People / sq mi
$108,309
Median Income
$414,600
Median Home Value
Williamson County covers 1,116 sq mi of land at 577.0 people per square mile.
About Williamson County, TX
Williamson County is a county in Texas with a population of 643,889. It ranks #12 among counties in Texas by population. The median age is 37.2, younger than the national median. The population is 49.7% male and 50.3% female.
The median household income in Williamson County is $108,309, above the US median of $74,580. 4.4% of residents live below the federal poverty level. Home values sit at a median of $414,600, with monthly rent averaging $1,720. The homeownership rate of 67.1% is close to the national rate of 64.8%.
Educational attainment in Williamson County reflects 47.4% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 23.3% of workers primarily work from home, noticeably above the national work-from-home rate of 14.2%. The average commute is 27.9 minutes each way.
Williamson County Population History (2010-2024)
The county of Williamson County had a population of 426,568 in 2010 and 727,480 in 2024, a 70.5% growth over 14 years. The peak was 727,480 in 2024. Average annual growth rate: 3.89%.
727,480
Population (2024)
426,568
Population (2010)
727,480
Peak (2024)
3.89%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 426,568 |
| 2011 | 442,366 |
| 2012 | 456,144 |
| 2013 | 470,494 |
| 2014 | 488,446 |
| 2015 | 507,728 |
| 2016 | 528,207 |
| 2017 | 546,837 |
| 2018 | 567,465 |
| 2019 | 591,823 |
| 2020 | 615,631 |
| 2021 | 644,740 |
| 2022 | 673,951 |
| 2023 | 701,640 |
| 2024 | 727,480 |
Race & Ethnicity
| White | 63.8% |
| Black or African American | 6.9% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.9% |
| Two or More Races | 0.0% |
Age & Sex
37.2
Median Age
50.3%
Female
49.7%
Male
12.8%
Age 65+
Age Distribution
Children (under 15): 20.2% · Seniors (65+): 12.8%
Income & Poverty
| Median household income | $108,309+$32,017 vs state |
| Mean household income | $134,720 |
| Per-capita income | $51,260 |
| Poverty rate | 4.4%-6.1% vs state |
| Unemployment rate | 2.8% |
| Employment-to-population | 67.7% |
Top Industries by Employment
The largest employment sector in Williamson County is professional & business services, accounting for 20.2% of workers.
How residents commute
0.4%
Drive alone
1.0%
Carpool
66.0%
Public transit
23.3%
Work from home
27.9 min
Avg commute
Housing
$414,600+$154,200 vs state
Median home value
$1,720
Median rent
67.1%
Homeownership rate
251,600
Total housing units
96.1%
Occupied
3.9%
Vacant
32.9%
Renter-occupied
Social & access
90.5%
With health insurance
98.3%
With broadband internet
34.0%
Foreign-born
8.0%
Veterans (18+)
10.1%
With a disability
75.7%
Speak language other than English at home
Education
94.2%
High School+
47.4%
Bachelor's+
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County rankings
Common questions about Williamson County, TX
Frequently Asked Questions
Williamson County, Texas has a population of 643,889 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 12th-largest county in Texas. Population density is 577 people per square mile.
The population of Williamson County has grown 70.5% since 2010 (426,568 → 727,480), a +3.89% annualized rate.
The median household income in Williamson County, Texas is $108,309, with mean (average) household income of $134,720 and per-capita income of $51,260. 4.4% of residents live below the federal poverty level.
In Williamson County, the largest racial and ethnic groups are White (63.8%), Black or African American (6.9%), Hispanic or Latino (1.9%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Williamson County, Texas is 37.2 years. Residents are 50.3% female and 49.7% male.
The median home value in Williamson County is $414,600 and median monthly rent is $1,720. 67.1% of occupied housing units are owner-occupied. The county has 251,600 total housing units, 3.9% of which are vacant.
The largest employment sector in Williamson County, Texas is professional, scientific, and management services, employing 20.2% of workers. The unemployment rate is 2.8%.
Houston is among the largest cities associated with Williamson County, Texas, with a population of 2,300,419.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.