Washington County's 2026 population is estimated at 142,824, reflecting a 1.15% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Washington County is the 12th largest county in Tennessee. The 2010 population was 123,393 and has grown 15.75% since 2010.
Overall: 40.2 years
Female: 41.1 years
Male: 38.9 years
There are 110,815 adults, (25,751 of whom are seniors) in Washington County.
Female: 69,189 (50.8%)
Male: 67,072 (49.2%)
The racial composition of Washington County includes 86.77% White, 3.55% Black or African American, and smaller percentages for Asian, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 118,236 | 86.77% |
| Two or more races | 8,685 | 6.37% |
| Black or African American | 4,835 | 3.55% |
| Asian | 2,135 | 1.57% |
| Other race | 2,075 | 1.52% |
| Native American | 259 | 0.19% |
| Native Hawaiian or Pacific Islander | 36 | 0.03% |
Washington County 's average per capita income is $45,000. Household income levels show a median of $62,809. The poverty rate stands at 15.54%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $92,473 | $120,286 |
| Families | $82,315 | $108,595 |
| Households | $62,809 | $86,311 |
| Non Families | $37,562 | $50,640 |
Average Income
Median Household Income
Poverty Rate