Williamson County's 2026 population is estimated at 276,784, reflecting a 1.4% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Williamson County is the 6th largest county in Tennessee. The 2010 population was 184,082 and has grown 50.36% since 2010.
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
