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
What sets Williamson County apart is where people work — remote work is unusually prominent here, at 23.3% versus 14.0% nationally. With 643,889 residents, Williamson County is a county in Texas. It ranks #12 among counties in Texas by population.
Earnings sit at the high end: a median household income of $108,309, above the US median of $78,538. Hardship is rare relative to US counties: a poverty rate of just 4.4%, below the national 12.4%. Housing is expensive: the median home is worth $414,600, with typical rent around $1,720.
Williamson County is among the best-educated US counties: 47.4% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. Remote work is widespread — 23.3% of workers stay home, above the national 14.0%, and the average commute runs about 28 minutes each way.
The remote-work concentration is telling in Williamson County — it skews toward higher-income, college-educated workers and reshapes both commute patterns and housing demand.
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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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.