Washington County's 2026 population is estimated at 11,601, reflecting a 0.27% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Washington County is the 29th largest county in Idaho. The 2010 population was 10,177 and has grown 13.99% since 2010.
Data after 2023 is projected based on recent change
Overall: 45 years
Female: 45.7 years
Male: 43.9 years
There are 8,668 adults, (2,964 of whom are seniors) in Washington County.
Female: 5,572 (50%)
Male: 5,570 (50%)
The racial composition of Washington County includes 79.49% White, 7.57% other race, and smaller percentages for Native American, Asian, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 8,857 | 79.49% |
| Two or more races | 1,117 | 10.03% |
| Other race | 843 | 7.57% |
| Native American | 189 | 1.7% |
| Asian | 86 | 0.77% |
| Black or African American | 33 | 0.3% |
| Native Hawaiian or Pacific Islander | 17 | 0.15% |
Washington County 's average per capita income is $40,903. Household income levels show a median of $54,000. The poverty rate stands at 15.28%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $73,963 | - |
| Families | $67,318 | $91,359 |
| Households | $54,000 | $77,135 |
| Non Families | $32,455 | $40,311 |
Average Income
Median Household Income
Poverty Rate
