County · Tennessee
Williamson County, Tennessee
Williamson County, Tennessee. Williamson County had 272,061 residents in 2025 by the Census Bureau's estimate, up 9.8% since 2020, faster than Tennessee (+5.8%). It holds 8 places (8 cities, villages and boroughs) and 46 census tracts. GEOID 47187.
Williamson County is one of the 14 counties of the Nashville-Davidson--Murfreesboro--Franklin, TN metropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
272,061
Census Bureau estimate (no margin published)
2020 Census count: 247,726 · ACS 2020-2024: 260,351
Median household income
$135,594
±$4,044 (90% margin)
Tennessee: $69,595
Median home value
$751,900
±$14,835 (90% margin)
Tennessee: $286,700
Median gross rent
$1,969
±$53 (90% margin)
Tennessee: $1,189
How many people live in Williamson County, and is it growing?
The 2020 Census counted 247,726 residents in Williamson County. The Census Bureau estimates 272,061 for July 1, 2025, up 9.8% since 2020, faster than Tennessee (+5.8%). The 2020-2024 American Community Survey puts the population at 260,351 over 583 square miles of land.
| Measure | Williamson County | Tennessee | Change since 2015-2019 |
|---|---|---|---|
| Total population | 260,351 | 7,066,383 | +34,962 |
| Households | 92,214±804 | 2,824,277 | +14,359 |
| Average household size | 2.81±0.02 | 2.45 | −0.08 |
| Housing units | 96,921±132 | 3,143,670 | +15,149 |
Williamson County's population since 2000
From 126,638 in 2000 to 272,061 in 2025: up 114.8%. 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 8 places: 8 cities, villages and boroughs (incorporated places). The largest is Franklin with 90,226 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Franklin | 83,454 | $119,528 |
|---|---|---|
| Brentwood | 45,373 | $182,088 |
| Spring Hill | 50,005 | $112,013 |
| Nolensville | 13,829 | $177,148 |
| Fairview | 9,357 | $91,131 |
| Thompson's Station | 7,485 | $132,647 |
| Smyrna | 53,070 | $81,926 |
| Eagleville | 813 | $88,317 |
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 40.4 years old; 25.8% are under 18 and 14.8% are 65 or older. The largest group is non-Hispanic white residents at 80.9%, then Hispanic or Latino residents (of any race) at 6.0%. 8.5% of residents were born outside the United States.
| Measure | Williamson County | Tennessee | Change since 2015-2019 |
|---|---|---|---|
| Median age | 40.4±0.3 | 38.9 | +1.3 |
| Under 18 years | 25.8% | 22.2% | – |
| 65 years and over | 14.8%±0.1 pts | 17.1% | – |
| Hispanic or Latino (any race) | 6.0% | 7.4% | +1.2 pts |
| White alone, not Hispanic | 80.9%±0.4 pts | 71.0% | −3.7 pts |
| Black or African American alone, not Hispanic | 3.9%±0.2 pts | 15.4% | no clear change |
| Asian alone, not Hispanic | 5.3%±0.2 pts | 1.9% | +1.1 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 | 0.0%±0.1 pts | 0.1% | – |
| Two or more races, not Hispanic | 3.3%±0.4 pts | 3.7% | – |
| Some other race alone, not Hispanic | 0.5%±0.3 pts | 0.4% | – |
| Born outside the United States | 8.5%±0.6 pts | 6.1% | +0.9 pts |
| Speak a language other than English at home (age 5+) | 9.8%±0.6 pts | 8.6% | – |
| Civilian veterans (age 18+) | 5.1%±0.4 pts | 7.3% | – |
| With a disability | 8.2%±0.5 pts | 14.9% | – |
| No health insurance coverage | 4.4%±0.6 pts | 10.0% | no clear change |
| High school graduate or higher (age 25+) | 96.3%±0.5 pts | 90.0% | – |
| Bachelor's degree or higher (age 25+) | 62.7%±1.0 pts | 31.1% | +2.9 pts |
| Graduate or professional degree (age 25+) | 24.0%±0.9 pts | 11.7% | – |
| Moved from another state in the past year | 3.7%±0.6 pts | 3.0% | – |
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 92,214 households earn less than $135,594 a year (±$4,044), against $69,595 in Tennessee. In 2015-2019 it was $139,022 in 2024 dollars; the margins of error cannot tell the two periods apart. 4.6% of residents live below the poverty line.
| Measure | Williamson County | Tennessee | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $135,594±$4,044 | $69,595 | no clear change |
| Mean household income | $183,026±$4,344 | $96,820 | – |
| Per capita income | $66,219±$1,469 | $39,437 | no clear change |
| People below the poverty line | 4.6%±0.6 pts | 13.8% | no clear change |
| Children under 18 below the poverty line | 4.8%±1.1 pts | 18.8% | no clear change |
| Households receiving SNAP | 1.9%±0.4 pts | 10.8% | – |
| Households with a broadband subscription | 96.0%±0.6 pts | 89.2% | – |
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 78.8% of Williamson County's occupied homes and renters 21.2%. The median owner-occupied home is valued at $751,900 by its owner (±$14,835). The median renter pays $1,969 a month including utilities, and 38.5% of renters pay 35% or more of their income on rent.
| Measure | Williamson County | Tennessee | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $751,900±$14,835 | $286,700 | +$199,318 |
| Median gross rent | $1,969±$53 | $1,189 | +$123 |
| Renters paying 35% or more of income on rent | 38.5%±4.0 pts | 39.7% | no clear change |
| Median monthly owner costs, with a mortgage | $2,642±$56 | $1,566 | – |
| Owner-occupied homes | 78.8%±1.1 pts | 66.9% | −1.8 pts |
| Housing units | 96,921±132 | 3,143,670 | +15,149 |
| Homeowner vacancy rate | 0.5%±0.3 pts | 0.9% | – |
| Rental vacancy rate | 6.7%±2.1 pts | 6.1% | – |
| Single-family detached homes | 77.6%±1.1 pts | 68.3% | – |
| Mobile homes | 1.5%±0.4 pts | 8.1% | – |
| Built 2020 or later | 4.8%±0.6 pts | 3.0% | – |
| Built 1939 or earlier | 2.3%±0.5 pts | 5.6% | – |
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 1,621 new housing units across Williamson County in 2025 (1,286 single-family), 6.0 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?
64.9% of Williamson County's workers drive alone and 28.3% work from home. The average trip to work takes 27.9 minutes. The unemployment rate in 2020-2024 averaged 2.4%.
| Measure | Williamson County | Tennessee | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 66.4%±0.8 pts | 62.4% | – |
| Unemployment rate | 2.4%±0.3 pts | 4.7% | no clear change |
| Drove alone to work | 64.9%±1.4 pts | 75.8% | – |
| Carpooled | 5.1%±0.7 pts | 8.4% | – |
| Public transportation | 0.1%±0.1 pts | 0.4% | – |
| Walked | 0.5%±0.2 pts | 1.2% | – |
| Worked from home | 28.3%±1.4 pts | 12.9% | +17.6 pts |
| Mean travel time to work | 27.9 min±0.9 | 25.7 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 46 census tracts. Among those with a reliable estimate, median household income runs from $81,750 (Tract 505.04) to $250,000 or more (Tract 503.05).
All 46 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 Tennessee's other counties?
| Measure | Rank |
|---|---|
| Population | 6th of 95 |
| Growth 2020-2025 | 15th of 95 |
| Residents per square mile | 6th of 95 |
| Median household income | 1st of 95 |
| Median home value | 1st of 95 |
| Median gross rent | 1st of 95 |
| Poverty rate | 95th of 95 |
| Bachelor's degree or higher | 1st of 95 |
| Median age | 62nd of 95 |
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.