Duncan, Oklahoma Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Duncan, Oklahoma is 22,872 as of the 2023 American Community Survey, making it the 20th-largest city in Oklahoma. The median household income is $57,020, the median home value is $125,800, and the median age is 40.0.
The population has declined 1.1% since 2010 (23,439 → 23,174).
22,872
Population
533
People / sq mi
$57,020
Median Income
$125,800
Median Home Value
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Duncan covers 42.9 sq mi of land at 533 people per square mile.
About Duncan, OK
Duncan stands apart on settlement density — it is among the most sparsely settled of US cities, at roughly 533 people per square mile. Duncan is a city in Oklahoma with a population of 22,872. It ranks #20 among cities in Oklahoma by population.
Earnings trail the nation, with the median household making $57,020, below the US median of $78,538. Roughly 14.1% of residents fall below the poverty line, above the national 12.4%. Real estate is inexpensive, with a typical home worth only $125,800, with typical rent around $872.
Fewer adults hold degrees here than in most comparable places — 19.5%, below the national 35.0%. Almost everyone commutes — only 4.7% work from home, below the national 14.0%, and the average commute runs about 21 minutes each way.
Duncan city Population History (2010-2024)
The city of Duncan city had a population of 23,439 in 2010 and 23,174 in 2024, a -1.1% growth over 14 years. The peak was 23,439 in 2010. Average annual growth rate: -0.08%.
23,174
Population (2024)
23,439
Population (2010)
23,439
Peak (2010)
-0.08%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 23,439 |
| 2011 | 23,431 |
| 2012 | 23,302 |
| 2013 | 23,341 |
| 2014 | 23,123 |
| 2015 | 23,125 |
| 2016 | 22,815 |
| 2017 | 22,477 |
| 2018 | 22,361 |
| 2019 | 22,344 |
| 2020 | 22,653 |
| 2021 | 22,781 |
| 2022 | 23,023 |
| 2023 | 23,198 |
| 2024 | 23,174 |
Race & Ethnicity
| White | 78.0% |
| Black or African American | 2.5% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 9.2% |
| Two or More Races | 0.0% |
Economy & Income
$57,020
Median Household Income
$33,531
Per Capita Income
14.1%
Poverty Rate
3.4%
Unemployment Rate
Housing
$125,800
Median Home Value
$872
Median Rent
67.8%
Owner-Occupied
Education
85.6%
High School+
19.5%
Bachelor's+
Commute
0.2%
Drive Alone
77.0%
Public Transit
4.7%
Work From Home
20.5 min
Avg Commute
Community Profile
31.5%
Foreign Born
92.6%
Non-English at Home
9.3%
Veterans
20.5%
With Disability
84.4%
Health Insurance
92.2%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 21.5% |
| Agriculture & Mining | 9.7% |
| Manufacturing | 9.3% |
| Education, Health Care & Social Services | 8.9% |
| Construction | 7.9% |
| Finance, Insurance & Real Estate | 6.8% |
| Arts, Entertainment & Food Services | 5.3% |
| Information | 4.7% |
| Retail Trade | 4.5% |
| Public Administration | 2.6% |
| Transportation & Warehousing | 1.0% |
Largest cities in Oklahoma
Largest counties in Oklahoma
Part of Oklahoma
Metro areas in Oklahoma
City rankings
Frequently Asked Questions
Duncan, Oklahoma has a population of 22,872 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 20th-largest city in Oklahoma.
The median household income in Duncan, Oklahoma is $57,020, with 14.1% of residents living below the federal poverty level.
The median home value in Duncan, Oklahoma is $125,800, with median monthly rent at $872 and a homeownership rate of 67.8%.
The median age in Duncan, Oklahoma is 40.0 years. The population is 48.6% male and 51.4% female.
The population has declined 1.1% since 2010 (23,439 → 23,174).
Duncan city, OK Climate
Duncan city, OK has an average annual temperature of 16.6°C (62°F) and receives about 838 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
16.6°C
Avg Temp
838
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 4° / 39° | 30 mm |
| February | 7° / 44° | 42 mm |
| March | 12° / 53° | 63 mm |
| April | 16° / 62° | 73 mm |
| May | 21° / 70° | 128 mm |
| June | 26° / 78° | 102 mm |
| July | 28° / 83° | 54 mm |
| August | 28° / 82° | 63 mm |
| September | 24° / 75° | 102 mm |
| October | 18° / 64° | 88 mm |
| November | 11° / 51° | 52 mm |
| December | 6° / 42° | 41 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Duncan city, OK
The most comfortable months to visit Duncan city, OK are typically May, October and September, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 35°C high). The coldest is January (near -3°C low). May is usually the wettest month.
Where to stay near Duncan
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Statewide data for Oklahoma
Population, race, income, age, and trends across Oklahoma
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.