Demographics of Williamson County, Texas

Williamson County, Texas had 752,827 people on July 1, 2025, by the Census Bureau’s estimate: +137,216 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Williamson County, in four figures

752,827
Population: July 1, 2025, Vintage 2025 estimate.; +22.3%
Change since July 2020: +137,216 people.; 37.3 ±0.2
Median age: ACS 2020–⁠2024.; $111,340 ±$1,581
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Williamson County, Texas's population grew 22.3% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Williamson County, Texas's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Williamson County, Texas's population grew 22.3% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Williamson County, Texas's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	615,611	100.0	100.0
2021	644,790	104.7	100.2
2022	674,478	109.6	100.7
2023	701,798	114.0	101.6
2024	729,013	118.4	102.5
2025	752,827	122.3	103.1

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Population of Williamson County, Texas on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	615,611	+6,552	+709	+37	+6,339
2021	644,790	+29,179	+3,268	+754	+26,658
2022	674,478	+29,688	+4,016	+4,194	+20,188
2023	701,798	+27,320	+4,253	+5,250	+17,467
2024	729,013	+27,215	+4,540	+7,751	+14,763
2025	752,827	+23,814	+4,552	+4,618	+14,764

Age, 2020–2024

The median age is 37.3 ±0.2: for men 36.7 ±0.2 and for women 37.8 ±0.2. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Williamson County by age, ACS 2020–2024
Age	People	Share	Texas	United States
Under 5	40,481 ±24	6.0% ±<0.1	6.4% ±<0.1	5.6% ±<0.1
5 to 17	121,465 ±2,034	18.1% ±0.3	18.6% ±0.1	16.3% ±<0.1
18 to 24	52,618 ±1,651	7.8% ±0.2	9.7% ±<0.1	9.1% ±<0.1
25 to 44	211,710 ±2,283	31.5% ±0.3	28.5% ±0.1	26.9% ±<0.1
45 to 64	159,506 ±1,885	23.7% ±0.3	23.3% ±<0.1	24.8% ±<0.1
65 and over	86,908 ±1,913	12.9% ±0.3	13.4% ±<0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $111,340 ±$1,581, and income per person $53,505 ±$723, in 2024 dollars. The median is $78,476 ±$263 in Texas and $80,734 ±$166 in the United States.

Households by income

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Households in Williamson County by income, ACS 2020–2024
Household income	Households	Share	Texas	United States
Under $25,000	18,252 ±1,377	7.2% ±0.5	14.6% ±0.1	14.6% ±<0.1
$25,000 to $49,999	25,967 ±1,534	10.3% ±0.6	17.3% ±0.1	16.7% ±<0.1
$50,000 to $74,999	36,449 ±1,590	14.4% ±0.6	16.1% ±0.1	15.5% ±<0.1
$75,000 to $99,999	31,171 ±1,430	12.4% ±0.6	12.8% ±0.1	12.6% ±<0.1
$100,000 to $149,999	52,736 ±2,009	20.9% ±0.8	17.3% ±0.1	17.5% ±<0.1
$150,000 to $199,999	37,420 ±1,753	14.8% ±0.7	9.5% ±0.1	9.6% ±<0.1
$200,000 or more	50,328 ±1,806	19.9% ±0.7	12.5% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Williamson County by age, ACS 2020–2024
Age	Below poverty	Rate	Texas	United States
All ages	42,919 ±3,486	6.4% ±0.5	13.8% ±0.1	12.5% ±0.1
Under 18	11,324 ±1,360	7.1% ±0.8	18.7% ±0.2	16.1% ±0.1
18 to 59	23,360 ±1,947	6.0% ±0.5	12.2% ±0.1	11.6% ±0.1
60 and over	8,235 ±823	6.9% ±0.7	12.0% ±0.1	11.0% ±<0.1

Housing, 2020–2024

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Housing in Williamson County, ACS 2020–2024
Measure	Williamson County	Texas	United States
Housing units	262,644 ±281	12,128,515 ±1,574	143,775,355 ±10,234
Occupied	96.1% ±0.4	90.6% ±0.1	89.9% ±0.1
Vacant	3.9% ±0.4	9.4% ±0.1	10.1% ±0.1
Owner occupied	66.4% ±0.6	62.6% ±0.3	65.2% ±0.3
Renter occupied	33.6% ±0.8	37.4% ±0.2	34.8% ±0.1
Median home value	$447,000 ±$3,593	$283,800 ±$738	$332,700 ±$236
Median gross rent	$1,796 ±$17	$1,403 ±$4	$1,413 ±$2
Median year built	2006 ±1	1992 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Williamson County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Texas	United States
Hispanic or Latino	166,454 ±0	24.7% ±<0.1	39.7% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	358,479 ±1,348	53.3% ±0.2	39.1% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	45,037 ±1,484	6.7% ±0.2	11.9% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	66,854 ±1,068	9.9% ±0.2	5.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	629 ±190	0.1% ±<0.1	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	787 ±182	0.1% ±<0.1	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	4,286 ±785	0.6% ±0.1	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	30,162 ±2,408	4.5% ±0.4	3.1% ±<0.1	4.3% ±<0.1

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Williamson County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Texas	United States
Born in the state	325,228 ±4,796	48.3% ±0.7	58.3% ±0.1	57.3% ±<0.1
Born in another state	224,517 ±4,715	33.4% ±0.7	22.5% ±0.1	26.9% ±<0.1
Born a citizen outside the states	13,903 ±1,407	2.1% ±0.2	1.7% ±<0.1	1.7% ±<0.1
Born abroad	109,040 ±3,532	16.2% ±0.5	17.6% ±0.1	14.1% ±<0.1
Naturalized citizens	50,136 ±1,906	7.5% ±0.3	7.4% ±<0.1	7.4% ±<0.1
Not citizens	58,904 ±2,932	8.8% ±0.4	10.2% ±0.1	6.8% ±<0.1

Williamson County among the counties of Texas

12th of 254 by population, July 2025. Every one is listed on the Texas page.

Counties of Texas near Williamson County in population, July 2025
County	July 2025	Change since 2020
Denton County	1,069,346	+16.9%
Fort Bend County	975,191	+17.4%
Hidalgo County	921,549	+5.6%
El Paso County	877,858	+1.3%
Montgomery County	781,194	+24.9%
Williamson County	752,827	+22.3%
Cameron County	433,946	+3.0%
Brazoria County	419,080	+12.2%
Bell County	402,248	+8.0%
Galveston County	372,207	+5.9%
Nueces County	352,992	−0.2%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026