| Place Name | Duncan |
| Place Type | Town |
| ZIP Code(s) | 29334 |
| County | Spartanburg County |
| Area Code(s) | 864 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 3,173 |
| Population Growth Rate (2010-19) | 27.04% |
| Majority Ethnicity | White 58.6% |
| Metro/Micro Stats Area | Spartanburg, SC |
| US Congressional District(s) | South Carolina 4th |
| State House Districts | 36 |
| State Senate Districts | 12 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 58.6% |
| African American | 31.94% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 9.45% |