Williamson County, Texas Demographics 2026

Population Overview

Williamson County is located in Texas with a total population of 643,889. It is the 12th most populous county out of 254 in Texas.

Age Demographics

The median age in Williamson County is 37.2 years. This is 5% higher than the state median of 35.5 years.

Economy, Income & Housing

The median household income in Williamson County is $108,309. This is 42% higher than the state median of $76,292. Compared to the national median of $78,538, household income here is 38% higher. The poverty rate stands at 6.3%. This is 54% lower than the state poverty rate of 13.8%. The unemployment rate is 4.0%. This is 22% lower than the state rate of 5.1%. The median home value is $414,600. Housing costs are 59% higher than the state median of $260,400. The home-value-to-income ratio is 3.8x. 67.1% of occupied housing units are owner-occupied. This homeownership rate is 7% higher than the state average of 62.6%.

Race & Ethnicity

The largest racial or ethnic group in Williamson County is White (non-Hispanic), making up 55.1% of the population. Hispanic or Latino residents account for 24.5%. The Asian population is significantly higher than the state average (8.9% vs 5.3%).

Education

47.4% 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 43% higher than the state rate of 33.1%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 94.2%. Notably, 16.9% of adults hold a graduate or professional degree, indicating a highly educated workforce.