Williamson County's estimated 2026 population is 275,636 with a growth rate of 1.31% in the past year according to the most recent United States census data. Williamson County is the 6th largest county in Tennessee. The 2010 population was 184,082 and has seen a growth of 49.74% since that time.
Data after 2023 is projected based on recent change
Overall: 40.4 years
Female: 41.1 years
Male: 39.7 years
There are 193,148 adults, (38,404 of whom are seniors) in Williamson County.
Female: 131,536 (50.5%)
Male: 128,815 (49.5%)
The racial composition of Williamson County includes 81.94% White, 5.37% Asian, 3.91% Black or African American, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 213,322 | 81.94% |
| Two or more races | 18,028 | 6.92% |
| Asian | 13,977 | 5.37% |
| Black or African American | 10,189 | 3.91% |
| Other race | 4,165 | 1.6% |
| Native American | 595 | 0.23% |
| Native Hawaiian or Pacific Islander | 75 | 0.03% |
Williamson County's average per capita income is $77,012. Household income levels show a median of $135,594. The poverty rate stands at 4.64%.
Name | Median | Mean |
|---|---|---|
| Married Families | $175,876 | $225,316 |
| Families | $161,181 | $210,016 |
| Households | $135,594 | $183,026 |
| Non Families | $67,736 | $88,083 |
Average Income
Median Household Income
Poverty Rate
