Williamson County, Tennessee Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 6th-largest in Tennessee
The population of Williamson County, Tennessee is 254,609 as of the 2023 American Community Survey, making it the 6th-largest county in Tennessee. The median household income is $131,202, the median home value is $673,700, and the median age is 40.3.
The population of Williamson County has grown 46.2% since 2010 (184,082 → 269,136), a +2.75% annualized rate.
254,609
Population
+2.75%
Annual growth
437
People / sq mi
$131,202
Median Income
$673,700
Median Home Value
Williamson County covers 583 sq mi of land at 436.8 people per square mile.
About Williamson County, TN
Williamson County is defined demographically by education — 61.8% of adults hold a bachelor’s degree, above the national average. Williamson County is a county in Tennessee with a population of 254,609. It is the #6-largest of all counties in Tennessee nationally.
Households here are among the highest-earning of all US counties: median income is $131,202, above the US median of $78,538. Poverty is among the lowest of comparable US counties, at 3.1% — below the national 12.4%. Real estate commands a premium here — a median home value of $673,700, with typical rent around $1,895.
Degree attainment is near the top of the range for US counties: 61.8% of adults 25+ hold a bachelor’s, above the 35.0% national rate. An unusually large 25.8% of workers are remote, above the national 14.0%, and the average commute runs about 28 minutes each way.
The education numbers are the throughline: a college-heavy population in Williamson County usually coincides with higher incomes and a workforce concentrated in professional and information industries.
Williamson County Population History (2010-2024)
The county of Williamson County had a population of 184,082 in 2010 and 269,136 in 2024, a 46.2% growth over 14 years. The peak was 269,136 in 2024. Average annual growth rate: 2.75%.
269,136
Population (2024)
184,082
Population (2010)
269,136
Peak (2024)
2.75%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 184,082 |
| 2011 | 188,464 |
| 2012 | 193,207 |
| 2013 | 199,177 |
| 2014 | 205,395 |
| 2015 | 211,713 |
| 2016 | 219,105 |
| 2017 | 226,373 |
| 2018 | 232,517 |
| 2019 | 238,556 |
| 2020 | 249,616 |
| 2021 | 256,155 |
| 2022 | 261,536 |
| 2023 | 265,312 |
| 2024 | 269,136 |
Race & Ethnicity
| White | 82.8% |
| Black or African American | 3.8% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.0% |
| Two or More Races | 0.0% |
Age & Sex
40.3
Median Age
50.6%
Female
49.4%
Male
14.3%
Age 65+
Age Distribution
Children (under 15): 20.9% · Seniors (65+): 14.3%
Income & Poverty
| Median household income | $131,202+$64,105 vs state |
| Mean household income | $177,673 |
| Per-capita income | $64,632 |
| Poverty rate | 3.1%-6.8% vs state |
| Unemployment rate | 1.3% |
| Employment-to-population | 65.6% |
Top Industries by Employment
The largest employment sector in Williamson County is professional & business services, accounting for 24.6% of workers.
How residents commute
0.1%
Drive alone
0.7%
Carpool
66.9%
Public transit
25.8%
Work from home
28.0 min
Avg commute
Housing
$673,700+$416,900 vs state
Median home value
$1,895
Median rent
79.8%
Homeownership rate
94,418
Total housing units
96.1%
Occupied
3.9%
Vacant
20.2%
Renter-occupied
Social & access
95.8%
With health insurance
98.1%
With broadband internet
51.3%
Foreign-born
5.5%
Veterans (18+)
7.8%
With a disability
90.6%
Speak language other than English at home
Education
95.9%
High School+
61.8%
Bachelor's+
Largest cities in Tennessee
Other counties in Tennessee
Part of Tennessee
Metro areas in Tennessee
County rankings
Frequently Asked Questions
Williamson County, Tennessee has a population of 254,609 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 6th-largest county in Tennessee. Population density is 437 people per square mile.
The population of Williamson County has grown 46.2% since 2010 (184,082 → 269,136), a +2.75% annualized rate.
The median household income in Williamson County, Tennessee is $131,202, with mean (average) household income of $177,673 and per-capita income of $64,632. 3.1% of residents live below the federal poverty level.
In Williamson County, the largest racial and ethnic groups are White (82.8%), Black or African American (3.8%), Hispanic or Latino (1.0%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Williamson County, Tennessee is 40.3 years. Residents are 50.6% female and 49.4% male.
The median home value in Williamson County is $673,700 and median monthly rent is $1,895. 79.8% of occupied housing units are owner-occupied. The county has 94,418 total housing units, 3.9% of which are vacant.
The largest employment sector in Williamson County, Tennessee is professional, scientific, and management services, employing 24.6% of workers. The unemployment rate is 1.3%.
Nashville-Davidson is among the largest cities associated with Williamson County, Tennessee, with a population of 684,298.
Williamson County, TN Climate
Williamson County, TN has an average annual temperature of 14.3°C (58°F) and receives about 1329 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
14.3°C
Avg Temp
1329
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 2° / 36° | 105 mm |
| February | 4° / 40° | 106 mm |
| March | 9° / 49° | 142 mm |
| April | 14° / 57° | 114 mm |
| May | 19° / 65° | 130 mm |
| June | 23° / 74° | 102 mm |
| July | 25° / 78° | 113 mm |
| August | 25° / 76° | 93 mm |
| September | 21° / 71° | 99 mm |
| October | 15° / 59° | 81 mm |
| November | 9° / 49° | 118 mm |
| December | 5° / 40° | 126 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Williamson County, TN
The most comfortable months to visit Williamson County, TN are typically September, June and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 32°C high). The coldest is January (near -3°C low). March is usually the wettest month.
Where to stay near Williamson County
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Population, race, income, age, and trends across Tennessee
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.