City in Stephens County, Oklahoma · 42.9 sq mi · 545 people per sq mi
23,388 people live in Duncan. The typical household earns $58,054, and the median resident is 39.9 years old.
2026 projection
From 22,692 in 2020
Poverty rate 20.5%
Men 38.3 · Women 41.9
1900–2026
23,388
2026 projection
3.1% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1900–2026
23,388
2026 projection
3.1% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 23,388 | +150 | 0.65% |
|---|---|---|---|
| 2025 | 23,238 | +12 | 0.05% |
| 2024 | 23,226 | +23 | 0.10% |
| 2023 | 23,203 | +199 | 0.87% |
| 2022 | 23,004 | +241 | 1.06% |
| 2021 | 22,763 | +71 | 0.31% |
| 2020 | 22,692 | -50 | 0.22% |
| 2019 | 22,742 | +52 | 0.23% |
| 2018 | 22,690 | -69 | 0.30% |
| 2017 | 22,759 | -309 | 1.34% |
Showing 10 of 28 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
Duncan is growing slower than Stephens County, Oklahoma, and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 230 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 5 residents
51% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 51% | 51% | 50% |
| Never married | 25% | 29% | 22% |
| Divorced | 14% | 13% | 14% |
| Widowed | 8% | 4% | 12% |
| Separated | 2% | 3% | 2% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources