| Name | Washington County |
| State | Missouri |
| FIPS Code | 29221 |
| County Seat | Potosi |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 23,542 |
| Population Growth Rate(2020-2024) | 0.11% |
| Majority Ethnicity | White 96.58% |
| Public School Majority Ethnicity | White 96% |
| Partisan Voting Index | Strongly Republican:+33 |
| Unemployment Rate (May 2026) | 5.6% |
| Sales Tax Rate (2025) | 7.23% |
| Area Code(s) | 235 / 573 / 636 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 96.58% |
| African American | 2.01% |
| Hispanic | 1.09% |
| Asian | 0.16% |
| Native American | 0.03% |
| Hawaiin/Pacific Islander | 0.14% |
| 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% |