Duncan, Oklahoma Population 2020

21,778

Duncan is a city located in Oklahoma. With a 2020 population of 21,778, it is the 21st largest city in Oklahoma and the 1729th largest city in the United States. Duncan is currently declining at a rate of -1.45% annually and its population has decreased by -7.05% since the most recent census, which recorded a population of 23,431 in 2010. Duncan reached it's highest population of 23,443 in 2010. Spanning over 48 miles, Duncan has a population density of 508 people per square mile.

The average household income in Duncan is $59,592 with a poverty rate of 16.61%. The median rental costs in recent years comes to $689 per month, and the median house value is $102,600. The median age in Duncan is 37.9 years, 35.9 years for males, and 39.5 years for females. For every 100 females there are 90.7 males.

Duncan Demographics

According to the most recent ACS, the racial composition of Duncan was:

  • White: 79.13%
  • Other race: 6.37%
  • Two or more races: 5.26%
  • Native American: 5.03%
  • Black or African American: 3.13%
  • Asian: 0.98%
  • Native Hawaiian or Pacific Islander: 0.10%
The current population of Duncan, Oklahoma is 21,778, based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 22,420.The last official US Census in 2010 recorded the population at 23,431.

Duncan, Oklahoma Population 2020

Year Total Population Growth Annual Growth Rate
202042,973-146-0.34%
201943,119-146-0.34%
201843,265-146-0.34%
201743,411-626-1.44%
201644,037-570-1.29%
201544,607140.03%
201444,593-413-0.93%
201345,0061020.23%
201244,904-213-0.47%
201145,117140.03%
201045,1030.00%

Population by Race

Race Population Percentage
White18,06079.13%
Some Other Race1,4536.37%
Two or More Races1,2015.26%
American Indian and Alaska Native1,1495.03%
Black or African American7153.13%
Asian2230.98%
Native Hawaiian and Other Pacific Islander220.10%

Duncan Population Pyramid 2020

Duncan Median Age

37.9


Total

35.9


Male

39.5


Female

Duncan Adults

There are 17,146 adults, (3,985 of whom are seniors) in Duncan.

Duncan Age Dependency

73.4

Age Dependency Ratio

30.3

Old Age Dependency Ratio

43.1

Child Dependency Ratio

Duncan Sex Ratio

Female

11,969

52.44%

Male

10,854

47.56%

Duncan Households and Families

Duncan Renter vs Owner Occupied by Household Type

Duncan Household Types

Type Owner Renter
Married77.3%22.7%
All64.4%35.6%
Non Family55.5%44.5%
Male50.6%49.4%
Female49.5%50.5%

64.4%

Rate of Home Ownership

Type Count Average Size Owned
All8,9592.564.4
Married4,0843.1777.3
Non Family3,3411.2255.5
Female1,0913.5249.5
Male4433.4350.6

3.16

Average Family Size

2.5

Average Household Size

5.9%

Unmarried (Opposite Sex)

0.1%

Unmarried (Same Sex)

Duncan Education

Education Attained Count Percentage
Less Than 9th Grade6234.04%
9th to 12th Grade1,3418.70%
High School Graduate5,96238.68%
Some College3,81424.75%
Associates Degree8155.29%
Bachelors Degree2,04913.29%
Graduate Degree8095.25%

Duncan Educational Attainment by Race

Name Total High School Bachelors
White12,33511,0382,492
Hispanic1,24187055
Other Race71347725
Native American675627113
Multiple Races55248599
Black50535664
Asian1548335
Islander222215

The highest rate of high school graduation is among islander people with a rate of 100.00%.

The highest rate of bachelors degrees is among islander people with a rate of 68.18%.

Name Average Male Female
Overall$29,380$40,771$22,145
Less Than High School$23,274$26,250$12,031
High School Grad$26,924$36,827$21,904
Some College$26,971$43,167$21,238
Bachelors Degree$46,393$69,444$33,005
Graduate Degree$58,000$66,000$42,188

$29,380

Average Earnings

$40,771

Average Male

$22,145

Average Female

Duncan Language

Duncan Language by Age

Duncan Language

91.77% of Duncan residents speak only English, while 8.23% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 6.82% of the population.

Duncan Poverty

Duncan Poverty by Race

Name Total In Poverty Poverty Rate
White16,8022,60815.52%
Hispanic2,56447618.56%
Native1,09826924.50%
Other1,44626718.46%
Multiple1,14622619.72%
Black6619814.83%
Asian2236529.15%

16.61%

Overall Poverty Rate

13.88%

Male Poverty Rate

19.05%

Female Poverty Rate

Poverty in Duncan

The race most likely to be in poverty in Duncan is Asian, with 29.15% below the poverty level.

The race least likely to be in poverty in Duncan is Black, with 14.83% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 4.32%. Among those working part-time, it was 18.19%, and for those that did not work, the poverty rate was 22.14%.

Name Poverty
Less Than High School23.34%
Some College14.29%
High School14.09%
Bachelors or Greater4.25%
Name Poverty
Male Unemployed31.31%
Female Unemployed29.52%
Female Employed10.67%
Male Employed5.85%

Duncan Income

Duncan Income by Household Type

Name Median Mean
Households$42,236$59,592
Families$55,045$73,091
Married Families$68,178-
Non Families$25,088$34,331

Duncan Marital Status

Duncan Marital Status

Marriage Rates

49.5%

Overall Marriage Rate

51.8%

Male Marriage Rate

47.4%

Female Marriage Rate

Duncan Married by Age and Sex

Duncan Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 45-54.

Duncan Marital Status by Race

Duncan Veterans

1,740

Number of Veterans

1,512

Male Veterans

228

Female Veterans

War Veterans
Vietnam694
Second Gulf War312
First Gulf War253
World War II123
Korea122
Age Group Veterans
75+453
65 to 74434
35 to 54389
55 to 64291
18 to 34173
Name Veterans % of Total
White1,44910.36%
Indian12516.71%
Black9616.78%
2 or More6610.54%
Hispanic472.96%
Other40.40%

$Duncan Veterans by Education

9.64%

Veteran Poverty Rate

34.01%

Veteran Disability Rate

Duncan Employment Status

57.4%

Labor Force Participation

53.6%

Employment Rate

6.5%

Unemployment Rate

Duncan Place of Birth

Origin of Non-Citizens

Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

63.89%

Born in Oklahoma

95.89%

Native Born

4.11%

Foreign Born

2.44%

Non Citizen

Place of Birth

95.89% of Duncan residents were born in the United States, with 63.89% having been born in Oklahoma. 2.44% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Year Population Growth Annual Growth Rate
202021,778-321-1.45%
201922,099-321-1.43%
201822,420-105-0.47%
201722,525-321-1.41%
201622,846-302-1.30%
201523,14830.01%
201423,145-217-0.93%
201323,362440.19%
201223,318-122-0.52%
201123,440-3-0.01%
201023,4439380.41%
200022,5057730.35%
199021,732-785-0.35%
198022,5172,7991.34%
197019,718-291-0.15%
196020,0094,6842.70%
195015,3256,1185.23%
19409,2078440.97%
19308,3634,9009.22%
19203,4630.00%