Washington County's 2026 population is estimated at 290,796, reflecting a 1.36% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Washington County is the 5th largest county in Minnesota. The 2010 population was 238,933 and has grown 21.71% since 2010.
Overall: 39.8 years
Female: 40.5 years
Male: 39 years
There are 210,044 adults, (45,973 of whom are seniors) in Washington County.
Female: 138,820 (50.3%)
Male: 137,418 (49.7%)
The racial composition of Washington County includes 78.13% White, 7.71% Asian, 5.56% 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 | 215,812 | 78.13% |
| Asian | 21,295 | 7.71% |
| Two or more races | 16,945 | 6.13% |
| Black or African American | 15,355 | 5.56% |
| Other race | 6,035 | 2.18% |
| Native American | 689 | 0.25% |
| Native Hawaiian or Pacific Islander | 107 | 0.04% |
Washington County 's average per capita income is $70,179. Household income levels show a median of $115,345. The poverty rate stands at 5.12%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $153,701 | $189,786 |
| Families | $135,522 | $170,687 |
| Households | $115,345 | $148,415 |
| Non Families | $65,375 | $89,315 |
Average Income
Median Household Income
Poverty Rate