| Place Name | Greencastle |
| Place Type | City |
| ZIP Code(s) | 63544 |
| County | Sullivan County |
| Area Code(s) | 660 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 253 |
| Population Growth Rate (2010-19) | -18.55% |
| Majority Ethnicity | White 92.42% |
| US Congressional District(s) | Missouri 6th |
| State House Districts | 3 |
| State Senate Districts | 12 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 92.42% |
| African American | 0% |
| Hispanic | 3.32% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.27% |