| Place Name | Duncan |
| Place Type | City |
| ZIP Code(s) | 73533 |
| County | Stephens County |
| Area Code(s) | 580 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 23,332 |
| Population Growth Rate (2010-19) | -3.15% |
| Majority Ethnicity | White 80.18% |
| Metro/Micro Stats Area | Duncan, OK |
| US Congressional District(s) | Oklahoma 4th |
| State House Districts | 50,51 |
| State Senate Districts | 31,43 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 80.18% |
| African American | 2.92% |
| Hispanic | 4.49% |
| Asian | 0.72% |
| Native American | 0.21% |
| Hawaiin/Pacific Islander | 11.48% |