Williamson County, Tennessee Demographics 2026

Population Overview

Williamson County is located in Tennessee with a total population of 254,609. It is the 6th most populous county out of 95 in Tennessee.

Age Demographics

The median age in Williamson County is 40.3 years. This is 4% higher than the state median of 38.9 years.

Economy, Income & Housing

The median household income in Williamson County is $131,202. This is 96% higher than the state median of $67,097. Compared to the national median of $78,538, household income here is 67% higher. The poverty rate stands at 4.5%. This is 67% 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 2.0%. This is 58% lower than the state rate of 4.7%. The median home value is $673,700. Housing costs are 162% higher than the state median of $256,800. The home-value-to-income ratio is 5.1x. 79.8% of occupied housing units are owner-occupied. This homeownership rate is 19% higher than the state average of 67.0%.

Race & Ethnicity

The largest racial or ethnic group in Williamson County is White (non-Hispanic), making up 81.5% of the population. Hispanic or Latino residents account for 5.8%. The Black or African American population (3.8%) is well below the state average of 15.7%. The Asian population is significantly higher than the state average (5.1% vs 1.8%).

Education

61.8% of residents aged 25 and older hold a bachelor's degree or higher. This places Williamson County in the top 10% of all cities in the state for educational attainment. This is 103% higher than the state rate of 30.4%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 95.9%. Notably, 23.5% of adults hold a graduate or professional degree, indicating a highly educated workforce.