Williamson County's estimated 2025 population is 747,027 with a growth rate of 3.45% 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 75.12% since that time.
Data after 2023 is projected based on recent change
The racial composition of Williamson County includes 63.81% White, 8.96% Asian, 6.9% Black or African American, 5% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 410,837 | 63.81% |
| Two or more races | 94,938 | 14.74% |
| Asian | 57,684 | 8.96% |
| Black or African American | 44,429 | 6.9% |
| Other race | 32,220 | 5% |
| Native American | 3,028 | 0.47% |
| Native Hawaiian or Pacific Islander | 753 | 0.12% |
Married
Widowed
Divorced
Separated
Never Married
Williamson County's average per capita income is $62,125. Household income levels show a median of $108,309. The poverty rate stands at 6.34%.
Name | Median | Mean |
|---|---|---|
| Married Families | $145,465 | $170,090 |
| Families | $129,273 | $153,927 |
| Households | $108,309 | $134,720 |
| Non Families | $64,859 | $84,780 |
Average Income
Median Household Income
Poverty Rate