Williamson County, TX Demographics

The total population of Williamson County is estimated to be 617,396 with 307,076 males (49.74%) and 310,320 females (50.26%). There are 3,244 more females than males in Williamson County.
The median household income in Williamson County was $102,368 in 2021, which marked an a decrease of 560(0.54%) from $102,928 in 2020. This income is 137.21% of the U.S. median household income of $74,606 (all incomes in 2022 inflation-adjusted dollars).
Per the latest American Community Survey by the Census Bureau, Williamson County sees its highest median household income among householders in the age group of 45 to 64 years old, at $117,335. Overall, the median household income for the county of Williamson County stands at $101,323.
In Williamson County, the median income for all workers aged 15 years and older, regardless of work hours, was $62,819 for males and $40,740 for females. However, when specifically considering full-time, year-round workers within the same age group, the median income was $82,035 for males and $59,490 for females.
In Williamson County, the demographic landscape is diverse, spanning 6 distinct racial categories among households. Among these, Asian households have the highest median household income at $140,889, while Some Other Race households represent the opposite end with the lowest median household income of $78,833.
In 2022, the population of Williamson County was 671,418, a 4.18% increase year-by-year from 2021. Previously, in 2021, Williamson County's population was 644,451, an increase of 4.70% compared to a population of 615,517 in 2020.
The median age in Williamson County, TX is 36.7, as per 2021 ACS 5-Year Estimates. Of the total population, 20.96% were under the age of 15, 18.54% aged 15 to 29, 48.30% aged 30 to 64, 11.04% aged 65 to 84, and 1.16% were 85 years of age and older.
Racial distribution of Williamson County population: 71.86% are White, 6.54% are Black or African American, 0.38% are American Indian and Alaska Native, 7.51% are Asian, 0.11% are Native Hawaiian and other Pacific Islander, 3.57% are some other race and 10.03% are multiracial.