Duncan Flag

Duncan

County:
Stephens County
County Seat:
Yes
Area (mi²):
42.94
State:
Oklahoma

Duncan is a city located in Stephens County, Oklahoma. Duncan has a 2026 population of 23,434. It is also the county seat of Stephens County. Duncan is currently growing at a rate of 0.56% annually and its population has increased by 3.45% since the most recent census, which recorded a population of 22,653 in 2020.

The median household income in Duncan is $58,054 with a poverty rate of 20.5%. The median age in Duncan is 39.9 years: 38.3 years for males, and 41.9 years for females. For every 100 females there are 95.8 males.

23.4K
Total Population
546
Density (mi²)
130 0.56%
Growth

Duncan Population

Duncan Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202623,4341300.56%
202523,3041300.56%
202423,174-24-0.1%
202323,1981750.76%
202223,0232421.06%
202122,7811060.47%
202022,6532751.23%
201922,378120.05%
201822,366-108-0.48%
201722,474-349-1.53%
201622,823-301-1.3%
201523,12410%
201423,123-220-0.94%
201323,343400.17%
201223,303-128-0.55%
201123,431-7-0.03%
201023,43870.03%
200022,5057733.56%
199021,732-785-3.49%
198022,5172,79914.2%
197019,718-291-1.45%
196020,0094,68430.56%
195015,3256,11866.45%
19409,20784410.09%
19308,3634,900141.5%
19203,46300%

Median Age

Overall: 39.9 years
Female: 41.9 years
Male: 38.3 years

Duncan Adults

There are 17,841 adults, (4,797 of whom are seniors) in Duncan.

Sex Ratio

Female: 11,728 (51.1%)
Male: 11,230 (48.9%)

Demographics

The racial composition of Duncan includes 77.25% White, and smaller percentages for Native American, Black or African American, other race, Asian and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White17,73677.25%
Two or more races3,33414.52%
Native American6792.96%
Black or African American5552.42%
Other race4982.17%
Asian1560.68%
Race
Population ↓
Percentage (of total)
Two or more races1,3535.89%
White7683.35%
Other race4341.89%
Black or African American640.28%
Native American560.24%
Asian130.06%
Race
Population ↓
Percentage (of total)
White16,96873.91%
Two or more races1,9818.63%
Native American6232.71%
Black or African American4912.14%
Asian1430.62%
Other race640.28%

Duncan Marital Status

Economics and Income Statistics

Duncan 's average per capita income is $39,558. Household income levels show a median of $58,054. The poverty rate stands at 20.5%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median ↓
Mean
Married Families$84,023-
Families$72,919$96,949
Households$58,054$80,829
Non Families$31,273$46,426

$39,558

Average Income

$58,054

Median Household Income

20.5%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)