County · Texas
Williamson County, Texas
Williamson County, Texas. Williamson County had 752,827 residents in 2025 by the Census Bureau's estimate, up 23.6% since 2020, faster than Texas (+8.8%). It holds 21 places (17 cities, villages and boroughs and 4 census-designated) and 135 census tracts. GEOID 48491.
Williamson County is one of the 5 counties of the Austin-Round Rock-San Marcos, TX metropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
752,827
Census Bureau estimate (no margin published)
2020 Census count: 609,017 · ACS 2020-2024: 672,688
Median household income
$111,340
±$1,581 (90% margin)
Texas: $78,476
Median home value
$447,000
±$3,593 (90% margin)
Texas: $283,800
Median gross rent
$1,796
±$17 (90% margin)
Texas: $1,403
How many people live in Williamson County, and is it growing?
The 2020 Census counted 609,017 residents in Williamson County. The Census Bureau estimates 752,827 for July 1, 2025, up 23.6% since 2020, faster than Texas (+8.8%). The 2020-2024 American Community Survey puts the population at 672,688 over 1,116 square miles of land.
| Measure | Williamson County | Texas | Change since 2015-2019 |
|---|---|---|---|
| Total population | 672,688 | 30,188,424 | +125,084 |
| Households | 252,323±1,054 | 10,992,816 | +72,163 |
| Average household size | 2.65±0.01 | 2.69 | −0.37 |
| Housing units | 262,644±281 | 12,128,515 | +70,156 |
Williamson County's population since 2000
From 249,967 in 2000 to 752,827 in 2025: up 201.2%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Williamson County?
Williamson County holds 21 places: 17 cities, villages and boroughs (incorporated places) and 4 census-designated places. The largest is Round Rock with 141,282 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Round Rock | 119,468 | $99,287 |
|---|---|---|
| Cedar Park | 77,595 | $129,545 |
| Georgetown | 67,176 | $95,062 |
| Austin | 961,855 | $93,658 |
| Leander | 59,202 | $139,048 |
| Hutto | 27,577 | $118,834 |
| Brushy Creek | 22,519 | $138,589 |
| Taylor | 16,267 | $75,508 |
| Sonterra | 7,679 | $92,319 |
| Liberty Hill | 3,646 | $115,096 |
| Santa Rita Ranch | 3,152 | $160,592 |
| Serenada | 2,098 | $154,653 |
| Jarrell | 1,753 | $111,333 |
| Granger | 1,183 | $73,145 |
| Florence | 1,171 | $78,750 |
| Bartlett | 1,633 | $67,438 |
| Thrall | 816 | $76,094 |
| WeirGEOID 4877056 | 699 | not published |
| CouplandGEOID 4817312 | 289 | not published |
| Pflugerville | 65,191 | $117,799 |
| Thorndale | 1,263 | $64,013 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Williamson County?
The median resident of Williamson County is 37.3 years old; 24.1% are under 18 and 12.9% are 65 or older. The largest group is non-Hispanic white residents at 53.3%, then Hispanic or Latino residents (of any race) at 24.7%. 16.2% of residents were born outside the United States.
| Measure | Williamson County | Texas | Change since 2015-2019 |
|---|---|---|---|
| Median age | 37.3±0.2 | 35.6 | +1.0 |
| Under 18 years | 24.1%±0.1 pts | 25.0% | – |
| 65 years and over | 12.9%±0.1 pts | 13.4% | – |
| Hispanic or Latino (any race) | 24.7% | 39.7% | +0.3 pts |
| White alone, not Hispanic | 53.3%±0.2 pts | 39.1% | −6.1 pts |
| Black or African American alone, not Hispanic | 6.7%±0.2 pts | 11.9% | +0.6 pts |
| Asian alone, not Hispanic | 9.9%±0.2 pts | 5.5% | +3.1 pts |
| American Indian and Alaska Native alone, not Hispanic | 0.1%±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.1%±0.1 pts | 0.1% | – |
| Two or more races, not Hispanic | 4.5%±0.4 pts | 3.1% | – |
| Some other race alone, not Hispanic | 0.6%±0.1 pts | 0.4% | – |
| Born outside the United States | 16.2%±0.5 pts | 17.6% | +3.6 pts |
| Speak a language other than English at home (age 5+) | 25.5%±0.6 pts | 35.1% | – |
| Civilian veterans (age 18+) | 7.6%±0.3 pts | 6.2% | – |
| With a disability | 10.6%±0.4 pts | 12.3% | – |
| No health insurance coverage | 9.8%±0.5 pts | 17.1% | no clear change |
| High school graduate or higher (age 25+) | 94.1%±0.4 pts | 86.0% | – |
| Bachelor's degree or higher (age 25+) | 48.4%±0.7 pts | 33.8% | +7.1 pts |
| Graduate or professional degree (age 25+) | 17.8%±0.5 pts | 12.3% | – |
| Moved from another state in the past year | 3.2%±0.4 pts | 2.0% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Williamson County earn?
Half of Williamson County's 252,323 households earn less than $111,340 a year (±$1,581), against $78,476 in Texas. In 2015-2019 the median was $107,485 in 2024 dollars, so it rose by $3,855 after inflation. 6.4% of residents live below the poverty line.
| Measure | Williamson County | Texas | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $111,340±$1,581 | $78,476 | +$3,855 |
| Mean household income | $140,407±$1,982 | $109,933 | – |
| Per capita income | $53,505±$723 | $40,752 | +$7,672 |
| People below the poverty line | 6.4%±0.5 pts | 13.8% | no clear change |
| Children under 18 below the poverty line | 7.1%±1.1 pts | 18.7% | no clear change |
| Households receiving SNAP | 4.4%±0.4 pts | 11.4% | – |
| Households with a broadband subscription | 95.8%±0.4 pts | 91.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Williamson County?
Owners occupy 66.4% of Williamson County's occupied homes and renters 33.6%. The median owner-occupied home is valued at $447,000 by its owner (±$3,593). The median renter pays $1,796 a month including utilities, and 38.0% of renters pay 35% or more of their income on rent.
| Measure | Williamson County | Texas | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $447,000±$3,593 | $283,800 | +$124,189 |
| Median gross rent | $1,796±$17 | $1,403 | +$163 |
| Renters paying 35% or more of income on rent | 38.0%±2.1 pts | 42.3% | +3.5 pts |
| Median monthly owner costs, with a mortgage | $2,453±$19 | $2,106 | – |
| Owner-occupied homes | 66.4%±0.7 pts | 62.6% | −2.0 pts |
| Housing units | 262,644±281 | 12,128,515 | +70,156 |
| Homeowner vacancy rate | 0.9%±0.3 pts | 1.1% | – |
| Rental vacancy rate | 4.2%±0.8 pts | 7.7% | – |
| Single-family detached homes | 72.5%±0.6 pts | 64.4% | – |
| Mobile homes | 1.9%±0.2 pts | 6.4% | – |
| Built 2020 or later | 9.7%±0.5 pts | 4.0% | – |
| Built 1939 or earlier | 1.3%±0.2 pts | 3.1% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Williamson County building?
Builders took permits for 4,956 new housing units across Williamson County in 2025 (3,945 single-family), 6.6 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Williamson County get to work?
63.9% of Williamson County's workers drive alone and 25.4% work from home. The average trip to work takes 27.9 minutes. The unemployment rate in 2020-2024 averaged 3.9%.
| Measure | Williamson County | Texas | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 70.7%±0.5 pts | 65.3% | – |
| Unemployment rate | 3.9%±0.3 pts | 5.3% | −0.9 pts |
| Drove alone to work | 63.9%±0.9 pts | 71.4% | – |
| Carpooled | 7.7%±0.6 pts | 10.0% | – |
| Public transportation | 0.3%±0.1 pts | 0.9% | – |
| Walked | 0.8%±0.1 pts | 1.5% | – |
| Worked from home | 25.4%±0.7 pts | 14.4% | +16.9 pts |
| Mean travel time to work | 27.9 min±0.4 | 26.7 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Williamson County's census tracts?
Williamson County is divided into 135 census tracts. Among those with a reliable estimate, median household income runs from $48,802 (Tract 212.03) to $229,664 (Tract 205.16).
All 135 census tracts of Williamson County, with their figures
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Williamson County compare with Texas's other counties?
| Measure | Rank |
|---|---|
| Population | 12th of 253 |
| Growth 2020-2025 | 10th of 254 |
| Residents per square mile | 14th of 254 |
| Median household income | 6th of 253 |
| Median home value | 6th of 247 |
| Median gross rent | 4th of 245 |
| Poverty rate | 234th of 240 |
| Bachelor's degree or higher | 6th of 252 |
| Median age | 156th of 254 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Williamson County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.