Demographics of Williamson County, Tennessee

Williamson County, Tennessee had 272,061 people on July 1, 2025, by the Census Bureau’s estimate: +22,447 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

272,061
Population: July 1, 2025, Vintage 2025 estimate.; +9.0%
Change since July 2020: +22,447 people.; 40.4 ±0.3
Median age: ACS 2020–⁠2024.; $135,594 ±$4,044
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, Tennessee's population grew 9.0% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Williamson County, Tennessee'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, Tennessee's population grew 9.0% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Williamson County, Tennessee'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	249,614	100.0	100.0
2021	256,192	102.6	100.2
2022	261,335	104.7	100.7
2023	264,898	106.1	101.6
2024	268,486	107.6	102.5
2025	272,061	109.0	103.1

3 more columns on a wider screen

Population of Williamson County, Tennessee on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	249,614	+1,824	+174	+6	+1,701
2021	256,192	+6,578	+518	+116	+6,080
2022	261,335	+5,143	+660	+839	+3,730
2023	264,898	+3,563	+711	+838	+2,081
2024	268,486	+3,588	+554	+1,324	+1,739
2025	272,061	+3,575	+551	+762	+2,274

Age, 2020–2024

The median age is 40.4 ±0.3: for men 39.7 ±0.5 and for women 41.1 ±0.4. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

2 more columns on a wider screen

People in Williamson County by age, ACS 2020–2024
Age	People	Share	Tennessee	United States
Under 5	13,726 ±254	5.3% ±0.1	5.8% ±<0.1	5.6% ±<0.1
5 to 17	53,477 ±1,357	20.5% ±0.5	16.4% ±0.1	16.3% ±<0.1
18 to 24	21,045 ±1,116	8.1% ±0.4	8.9% ±0.1	9.1% ±<0.1
25 to 44	60,956 ±1,486	23.4% ±0.6	26.7% ±0.1	26.9% ±<0.1
45 to 64	72,743 ±1,258	27.9% ±0.5	25.2% ±0.1	24.8% ±<0.1
65 and over	38,404 ±1,263	14.8% ±0.5	17.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $135,594 ±$4,044, and income per person $66,219 ±$1,469, in 2024 dollars. The median is $69,595 ±$429 in Tennessee and $80,734 ±$166 in the United States.

Households by income

2 more columns on a wider screen

Households in Williamson County by income, ACS 2020–2024
Household income	Households	Share	Tennessee	United States
Under $25,000	5,646 ±793	6.1% ±0.9	16.6% ±0.2	14.6% ±<0.1
$25,000 to $49,999	8,122 ±852	8.8% ±0.9	19.4% ±0.2	16.7% ±<0.1
$50,000 to $74,999	10,153 ±886	11.0% ±1.0	17.3% ±0.2	15.5% ±<0.1
$75,000 to $99,999	9,370 ±847	10.2% ±0.9	13.2% ±0.2	12.6% ±<0.1
$100,000 to $149,999	17,522 ±1,099	19.0% ±1.2	16.8% ±0.2	17.5% ±<0.1
$150,000 to $199,999	12,905 ±1,105	14.0% ±1.2	7.7% ±0.1	9.6% ±<0.1
$200,000 or more	28,496 ±1,266	30.9% ±1.3	9.0% ±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).

2 more columns on a wider screen

Poverty rate in Williamson County by age, ACS 2020–2024
Age	Below poverty	Rate	Tennessee	United States
All ages	12,032 ±1,536	4.6% ±0.6	13.8% ±0.2	12.5% ±0.1
Under 18	3,176 ±652	4.8% ±1.0	18.8% ±0.4	16.1% ±0.1
18 to 59	5,980 ±856	4.3% ±0.6	12.7% ±0.2	11.6% ±0.1
60 and over	2,876 ±536	5.4% ±1.0	11.4% ±0.2	11.0% ±<0.1

Housing, 2020–2024

1 more column on a wider screen

Housing in Williamson County, ACS 2020–2024
Measure	Williamson County	Tennessee	United States
Housing units	96,921 ±132	3,143,670 ±903	143,775,355 ±10,234
Occupied	95.1% ±0.8	89.8% ±0.2	89.9% ±0.1
Vacant	4.9% ±0.8	10.2% ±0.2	10.1% ±0.1
Owner occupied	78.8% ±0.9	66.9% ±0.3	65.2% ±0.3
Renter occupied	21.2% ±1.2	33.1% ±0.3	34.8% ±0.1
Median home value	$751,900 ±$14,835	$286,700 ±$1,492	$332,700 ±$236
Median gross rent	$1,969 ±$53	$1,189 ±$7	$1,413 ±$2
Median year built	2002 ±2	1987 ±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

2 more columns on a wider screen

People in Williamson County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Tennessee	United States
Hispanic or Latino	15,611 ±0	6.0% ±<0.1	7.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	210,687 ±967	80.9% ±0.4	71.0% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	10,162 ±611	3.9% ±0.2	15.4% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	13,865 ±562	5.3% ±0.2	1.9% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	63 to 203	< 0.1% to 0.1%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 33	0% to < 0.1%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	1,418 ±656	0.5% ±0.3	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	8,475 ±1,067	3.3% ±0.4	3.7% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

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).

2 more columns on a wider screen

People in Williamson County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Tennessee	United States
Born in the state	100,591 ±2,807	38.6% ±1.1	57.2% ±0.2	57.3% ±<0.1
Born in another state	134,228 ±3,004	51.6% ±1.2	35.7% ±0.2	26.9% ±<0.1
Born a citizen outside the states	3,413 ±600	1.3% ±0.2	1.0% ±<0.1	1.7% ±<0.1
Born abroad	22,119 ±1,452	8.5% ±0.6	6.1% ±0.1	14.1% ±<0.1
Naturalized citizens	9,817 ±750	3.8% ±0.3	2.4% ±0.1	7.4% ±<0.1
Not citizens	12,302 ±1,446	4.7% ±0.6	3.7% ±0.1	6.8% ±<0.1

Williamson County among the counties of Tennessee

6th of 95 by population, July 2025. Every one is listed on the Tennessee page.

Counties of Tennessee near Williamson County in population, July 2025
County	July 2025	Change since 2020
Shelby County	910,226	−2.1%
Davidson County	745,904	+4.2%
Knox County	511,453	+6.4%
Hamilton County	390,833	+6.2%
Rutherford County	386,352	+12.5%
Williamson County	272,061	+9.0%
Montgomery County	249,935	+12.9%
Sumner County	215,538	+9.2%
Wilson County	175,033	+17.7%
Sullivan County	163,759	+3.5%
Blount County	143,820	+6.0%

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