Washington County's 2026 population is estimated at 23,665, reflecting a 0.17% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Washington County is the 47th largest county in Missouri. The 2010 population was 25,198 and has grown -6.08% since 2010.
Data after 2023 is projected based on recent change
Overall: 40.7 years
Female: 42.1 years
Male: 39.8 years
There are 17,944 adults, (4,208 of whom are seniors) in Washington County.
Female: 11,293 (48.1%)
Male: 12,177 (51.9%)
The racial composition of Washington County includes 92.1% White, and smaller percentages for Black or African American, other race, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 21,617 | 92.1% |
| Two or more races | 1,265 | 5.39% |
| Black or African American | 416 | 1.77% |
| Other race | 135 | 0.58% |
| Asian | 31 | 0.13% |
| Native American | 6 | 0.03% |
Washington County 's average per capita income is $41,592. Household income levels show a median of $56,043. The poverty rate stands at 17.38%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $79,906 | - |
| Families | $73,902 | $80,094 |
| Households | $56,043 | $75,592 |
| Non Families | $26,308 | $61,801 |
Average Income
Median Household Income
Poverty Rate
