Williamson County, Tennessee Demographics 2026
Williamson County, Tennessee has a population of 260,351, the 6th most populous county in Tennessee. The median household income is $135,594 and the median home value is $751,900. The poverty rate is 4.6%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Williamson County Quick Facts
How Williamson County Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 254,609 | 260,351 | +2.3% |
| Median household income | $131,202 | $135,594 | +3.3% |
| Median home value | $673,700 | $751,900 | +11.6% |
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 46 | National average: 61
Education
Educational Attainment (Adults 25+)
Cities & Places in Williamson County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Franklin | 87,133 | $119,528 | 4.7% | $705,400 |
| Spring Hill | 55,765 | $112,013 | 4.3% | $493,800 |
| Brentwood | 45,556 | $182,088 | 3.6% | $1,031,300 |
| Nolensville | 15,074 | $177,148 | 2.1% | $777,800 |
| Fairview | 10,009 | $91,131 | 11.6% | $390,200 |
| Thompson's Station | 8,294 | $132,647 | 3.5% | $700,500 |
Explore Tennessee Rankings
Population Overview
Williamson County is located in Tennessee with a total population of 260,351. It is the 6th most populous county out of 95 in Tennessee. The county encompasses 6 Census-designated places.
Age Demographics
The median age in Williamson County is 40.4 years. This is 4% higher than the state median of 38.9 years.
Economy, Income & Housing
The median household income in Williamson County is $135,594. This is 95% higher than the state median of $69,595. It is also 68% higher than the national median of $80,734. The poverty rate stands at 4.6%. This is 66% lower than the state poverty rate of 13.8%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 2.4%. This is 48% lower than the state rate of 4.7%. The median home value is $751,900. Housing costs are 162% higher than the state median of $286,700. The home-value-to-income ratio is 5.5x. 78.8% of occupied housing units are owner-occupied. This homeownership rate is 18% higher than the state average of 66.9%.
Race & Ethnicity
The largest racial or ethnic group in Williamson County is White (non-Hispanic), making up 80.9% of the population. Hispanic or Latino residents account for 6.0%. The Black or African American population (3.9%) is well below the state average of 15.4%. The Asian population is significantly higher than the state average (5.3% vs 1.9%).
Education
62.7% of residents aged 25 and older hold a bachelor's degree or higher. This places Williamson County in the top 10% of all counties in the state for educational attainment. This is 102% higher than the state rate of 31.1%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 96.3%. Notably, 24.0% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All figures for Williamson County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Tennessee and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.
Frequently Asked Questions
What is the population of Williamson County, Tennessee?
Williamson County has a population of 260,351, making it the 6th most populous county in Tennessee.
What is the median income in Williamson County?
The median household income in Williamson County is $135,594 with a poverty rate of 4.6%.
How many cities are in Williamson County, Tennessee?
Williamson County contains 6 Census-designated places.