Duncan ZIP Codes — Stephens County, OK

There are 3 unique ZIP codes in Duncan, Oklahoma. Area code: 580.

ZIP codes

329.54

sq mi land

4.26

sq mi water

580

area code

Duncan, OK ZIP code map

About Duncan, OK

Duncan, Oklahoma, is a vibrant city located in the heart of Stephens County. Known for its rich history and friendly community, Duncan serves as a hub of activity for both residents and visitors alike. The city boasts a blend of small-town charm and modern amenities, making it an attractive place for families and entrepreneurs.

Location & geography

Geographically, Duncan is situated in south-central Oklahoma, offering a convenient central location within the state. It is surrounded by several nearby cities including Marlow, which is approximately 10 miles to the northeast, and Lawton, roughly 30 miles to the southwest. The city's land area encompasses approximately 329.54 square miles, with a water area of 4.26 square miles that includes beautiful lakes and rivers.

Community & economy

Duncan's character is deeply rooted in its community-oriented values and diverse population. The local economy thrives on various industries, including agriculture, manufacturing, and healthcare, which provide ample job opportunities for residents. Daily life in Duncan is filled with local events, bustling markets, and recreational activities that foster a strong sense of belonging.

Transportation

Transportation in Duncan is facilitated by major highways such as U.S. Route 81 and U.S. Route 70, making it easily accessible for travelers. The nearest airport is the Duncan Municipal Airport, which provides services for general aviation. Public transit options are limited, but the city's layout and road networks make it commuter-friendly.

History

Duncan was founded in 1892 and quickly established itself as a prominent center for the local cotton industry, thanks to fertile surrounding lands. Over the years, key industries such as oil and gas also played a significant role in the city’s economy, fostering growth and development. Notable events include the annual Chisholm Trail Heritage Center festivities, which celebrate the city’s historical connections to cattle ranching.

Did you know?

An interesting fact about Duncan is that it was named after the local railroad official, William Duncan, who helped shape the town's early infrastructure. Additionally, Duncan is home to a large number of antique shops, making it a surprising destination for vintage lovers.

ZIP codes for Duncan, OK (3)

ZIP code	City	County	Map
73533	Duncan	Stephens	View map
73534	Duncan	Stephens	View map
73536	Duncan	Stephens	View map

Demographics & statistics

27,866

Population

39.5

Median age

$56,934

Median household income

$31,495

Per capita income

$129,300

Median home value

$842

Median monthly rent

71.0%

Home ownership

17.4%

Poverty rate

4.7%

Unemployment

9,820

Housing units

19.2%

Bachelor's or higher

Age distribution

Male Female

794

Under 5

842

795

5–9

844

940

10–14

997

900

15–19

955

767

20–24

815

1,660

25–34

1,762

1,707

35–44

1,812

1,485

45–54

1,576

787

55–59

835

1,003

60–64

1,065

1,597

65–74

1,696

755

75–84

802

327

85+

348

← Male

Female →

Age summary

Group	Count	%
Under 18	6,389	22.9%
18 and over	21,477	77.1%
65 and over	5,525	19.8%
Median age	39.5 years

Race & ethnicity

White 73.2%

Two or more races 9.1%

Hispanic or Latino 6.6%

Other race 4.1%

American Indian / Alaska Native 3.9%

Black or African American 2.3%

Asian 0.6%

Native Hawaiian / Pacific Islander 0.2%

Group	Count	%
White	21,844	73.2%
Two or more races	2,713	9.1%
Hispanic or Latino	1,983	6.6%
Other race	1,214	4.1%
American Indian / Alaska Native	1,156	3.9%
Black or African American	673	2.3%
Asian	193	0.6%
Native Hawaiian / Pacific Islander	73	0.2%

Household income

Under $10k 6.9%

$10k–$15k 5.3%

$15k–$25k 8.7%

$25k–$35k 11.2%

$35k–$50k 12.0%

$50k–$75k 18.4%

$75k–$100k 14.3%

$100k–$150k 11.9%

$150k–$200k 6.5%

$200k+ 4.8%

Range	% of households
Under $10k	6.9%
$10k–$15k	5.3%
$15k–$25k	8.7%
$25k–$35k	11.2%
$35k–$50k	12.0%
$50k–$75k	18.4%
$75k–$100k	14.3%
$100k–$150k	11.9%
$150k–$200k	6.5%
$200k+	4.8%
Median income	$56,934

Housing

Home values

Under $50k 15.5%

$50k–$100k 21.3%

$100k–$150k 21.7%

$150k–$200k 17.0%

$200k–$300k 15.8%

$300k–$500k 6.5%

$500k–$1M 1.9%

$1M+ 0.3%

Housing overview

Metric	Value
Median home value	$129,300
Median rent / month	$842
Owner occupied	71.0%
Renter occupied	29.0%
Vacant	15.2%
Single-family detached	83.0%
Large apartment buildings	2.6%
Mobile homes	4.3%
Median rooms	5.6
Avg household size (owned)	2.49

Year built

Era	%
2020 or later	0.2%
2010–2019	2.6%
2000–2009	6.2%
1990–1999	7.9%
1980–1989	14.5%
1970–1979	24.0%
1960–1969	12.3%
1950–1959	15.9%
1940–1949	8.3%
1939 or earlier	8.0%

Bedrooms

Size	% of units
No bedroom (studio)	1.9%
1 bedroom	6.6%
2 bedrooms	28.1%
3 bedrooms	51.3%
4 bedrooms	10.8%
5+ bedrooms	1.3%

Vehicles per household

Vehicles	% of households
No vehicle	8.6%
1 vehicle	31.0%
2 vehicles	37.5%
3 or more	23.0%

Heating fuel

Fuel type	%
Utility gas	52.7%
Electricity	39.0%
Propane / LP gas	3.9%
Fuel oil	0.1%
Wood	1.7%
Solar	0.3%
No fuel used	0.2%

Households & families

Household type	Count	%
Married-couple family	5,561	50.3%
Cohabiting couple	715	6.5%
Male householder, no spouse	1,854	16.8%
Female householder, no spouse	2,918	26.4%
Households with children under 18	3,354	30.4%
Households with seniors (65+)	4,002	36.2%
Average household size	2.48

Marital status

Status	Male	Female
Never married	28.2%	20.5%
Married	52.6%	52.0%
Separated	1.9%	1.4%
Widowed	3.8%	11.9%
Divorced	13.5%	14.2%

Education

Less than 9th grade 4.0%

Some HS, no diploma 8.9%

HS graduate 40.8%

Some college, no degree 22.4%

Associate's degree 4.8%

Bachelor's degree 12.2%

Graduate / professional 7.0%

Metric	%
HS diploma or higher	87.2%
Bachelor's or higher	19.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	344	5.6%
Kindergarten	395	6.4%
Elementary school	2,819	46.0%
High school	1,737	28.3%
College / grad school	835	13.6%

Employment

Industry of employment

Education & healthcare 19.5%

Retail trade 16.4%

Agriculture & mining 11.5%

Manufacturing 9.0%

Construction 8.0%

Arts, food & hospitality 8.0%

Professional & management 7.2%

Other services 5.2%

Transportation & utilities 4.9%

Finance & real estate 4.4%

Public administration 3.4%

Wholesale trade 1.7%

Information 0.8%

Occupation

Category	%
Management, business & arts	30.4%
Service	14.0%
Sales & office	21.9%
Natural resources & construction	15.0%
Production & transportation	18.8%

Employment type

Type	%
Private sector	82.0%
Government	10.6%
Self-employed	7.0%
Unpaid family workers	0.4%

Commute

Method	%
Drive alone	80.8%
Carpool	12.6%
Public transit	0.0%
Walk	1.3%
Other means	1.8%
Avg commute (minutes)	22.5

Poverty

All people 17.4%

Under 18 years 23.2%

18 and over 15.7%

Married-couple families 7.5%

Female-led households 31.9%

Income support

Source	% of households
Social Security	38.8%
Retirement income	23.0%
Supplemental Security	7.4%
Cash public assistance	3.4%
Food stamps / SNAP	18.6%

Health indicators

Condition	%
High blood pressure	40.6%
High cholesterol	36.0%
Heart disease	8.1%
Stroke	3.9%
Asthma	10.9%
Arthritis	29.4%
Kidney disease	3.5%
Pulmonary disease	9.6%
Cancer	7.5%

Behavior / access	%
Binge drinking	12.1%
No physical activity	32.9%
Less than 7 hrs sleep	34.8%
Fair or poor health	19.5%
Poor mental health	16.7%
Poor physical health	13.4%
No health insurance	18.9%
Visited doctor (checkup)	75.4%
Visited dentist	56.2%
Cholesterol screening	88.1%
Teeth loss	18.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,937	9.0%

Disability	%
Any disability	21.2%
Under 18	5.0%
18–64 years	18.7%
65 and over	48.2%

Health insurance coverage

Type	%
Private insurance	55.2%
Public insurance	44.3%
Uninsured under 19	7.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	26,230	94.1%
Spanish	638	2.4%
Other Indo-European	519	2.0%
Asian & Pacific Islander	48	0.2%
Other languages	71	0.3%

Place of birth & citizenship

Origin	Count	%
Native born (US)	26,932	96.6%
Born in same state	26,738	96.0%
Born in different state	18,110	65.0%
Foreign born	194	0.7%
Naturalized citizen	934	3.4%
Not a US citizen	351	37.6%

Ancestry

Ancestry	Count	%
Italian	3,210	11.5%
French	2,909	10.4%
Arab	2,605	9.3%
English	251	0.9%

Ancestry	Count	%
Polish	211	0.8%
Irish	103	0.4%
German	6	0%
Dutch	2	0%

Technology access

Metric	% of households
Computer access	39.6%
Internet access	90.9%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does Duncan, OK have?

Duncan, OK has two ZIP codes: 73533 and 73536. Each ZIP code serves a distinct delivery area within the city and surrounding region.