Washington County's 2026 population is estimated at 624,154, reflecting a 1.04% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Washington County is the 2nd largest county in Oregon. The 2010 population was 531,652 and has grown 17.4% since 2010.
Data after 2023 is projected based on recent change
Overall: 38.1 years
Female: 38.9 years
Male: 37.3 years
There are 473,722 adults, (89,208 of whom are seniors) in Washington County.
Female: 302,367 (50.1%)
Male: 301,580 (49.9%)
The racial composition of Washington County includes 63.49% White, 11.5% Asian, 7.45% other race, and smaller percentages for Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 383,443 | 63.49% |
| Two or more races | 83,241 | 13.78% |
| Asian | 69,474 | 11.5% |
| Other race | 45,020 | 7.45% |
| Black or African American | 13,996 | 2.32% |
| Native American | 5,533 | 0.92% |
| Native Hawaiian or Pacific Islander | 3,240 | 0.54% |
Washington County 's average per capita income is $64,586. Household income levels show a median of $107,772. The poverty rate stands at 8.05%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $148,225 | $179,023 |
| Families | $127,794 | $159,833 |
| Households | $107,772 | $137,880 |
| Non Families | $68,898 | $87,211 |
Average Income
Median Household Income
Poverty Rate
