| Place Name | Winchester |
| Place Type | City |
| ZIP Code(s) | 63021 |
| County | Saint Louis County |
| Area Code(s) | 636 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 1,723 |
| Population Growth Rate (2010-19) | -6.46% |
| Majority Ethnicity | White 64.91% |
| Metro/Micro Stats Area | St. Louis, MO-IL |
| US Congressional District(s) | Missouri 2nd |
| State House Districts | 100 |
| State Senate Districts | 24 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 64.91% |
| African American | 1.44% |
| Hispanic | 0.72% |
| Asian | 3.41% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 29.52% |