| Name | Washington County |
| State | Missouri |
| FIPS Code | 29221 |
| County Seat | Potosi |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 25,120 |
| Population Growth Rate(2000-2022) | -6.67% |
| Majority Ethnicity | White 97.84% |
| Public School Majority Ethnicity | White 96% |
| Partisan Voting Index | Strongly Republican:+33 |
| Unemployment Rate (June 2025) | 4.5% |
| Area Code(s) | 235 / 573 / 636 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 97.84% |
| African American | 1.75% |
| Hispanic | 0% |
| Asian | 0.1% |
| Native American | 0.16% |
| Hawaiin/Pacific Islander | 0.16% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 96.41% |
| African American | 0.39% |
| Hispanic | 0.77% |
| Asian | 0.12% |
| Native American | 0.06% |
| Hawaiin/Pacific Islander | 0.03% |