Williamson County's estimated 2026 population is 776,641 with a growth rate of 3.16% in the past year according to the most recent United States census data. Williamson County is the 12th largest county in Texas. The 2010 population was 426,568 and has seen a growth of 82.07% since that time.
Data after 2023 is projected based on recent change
Overall: 37.3 years
Female: 37.8 years
Male: 36.7 years
There are 510,742 adults, (86,908 of whom are seniors) in Williamson County.
Female: 337,421 (50.2%)
Male: 335,267 (49.8%)
The racial composition of Williamson County includes 59.61% White, 10.02% Asian, 6.97% Black or African American, 6.01% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 400,958 | 59.61% |
| Two or more races | 113,287 | 16.84% |
| Asian | 67,402 | 10.02% |
| Black or African American | 46,889 | 6.97% |
| Other race | 40,426 | 6.01% |
| Native American | 2,935 | 0.44% |
| Native Hawaiian or Pacific Islander | 791 | 0.12% |
Williamson County's average per capita income is $64,836. Household income levels show a median of $111,340. The poverty rate stands at 6.43%.
Name | Median | Mean |
|---|---|---|
| Married Families | $151,545 | $178,517 |
| Families | $134,158 | $160,996 |
| Households | $111,340 | $140,407 |
| Non Families | $65,739 | $87,079 |
Average Income
Median Household Income
Poverty Rate