Duncan, OK Profile: Facts, Map & Data


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Duncan, Oklahoma - Basic Facts

The City of Duncan had a population of 23,174 as of July 1, 2017.

The primary coordinate point for Duncan is located at latitude 34.5061 and longitude -98.0054 in Stephens County. The formal boundaries for the City of Duncan (see map below) encompass a land area of 42.87 sq. miles and a water area of 4.87 sq. miles. Stephens County is in the Central time zone (GMT -6). The elevation is 1,125 feet.

The City of Duncan (GNIS ID: 2410368) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Oklahoma is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of Duncan is located within Duncan Division of Stephens County.

Beneath the boundary map are tables with Duncan population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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City of Duncan, OK Boundary Map

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Boundary Maps: Duncan Division | Stephens County | Oklahoma Counties

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Duncan, OK Data & Demographics (As of July 1, 2017)


Total Population 23,174
Daytime Population: Workers 12,068
Daytime Population: Residents 14,710
Total Daytime Population (TDP) 26,778
Ratio TDP/Total Population1 1.16
Population in Households 22,764
Population in Familes 18,441
Population in Group Qrtrs 410
Population Density2 541
Diversity Index3 48


Median Household Income $44,946
Average Household Income $63,049
Per Capita Income $25,795


Total Housing Units 11,165 (100%)
Owner Occupied HU 6,124 (54.8%)
Renter Occupied HU 3,361 (30.1%)
Vacant Housing Units 1,680 (15.0%)
Median Home Value $109,743
Average Home Value $131,700


Total Households 9,485
Average Household Size 2.4
Family Households 6,263
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population -0.14% -0.15%
Households -0.25% -0.22%
Families -0.21% -0.29%
Median Household Income   1.78%
Per Capita Income   2.45%

Duncan, OK - Peer Comparisons by Rank and Percentile

The table below compares Duncan to the other 731 incorporated cities, towns and CDPs in Oklahoma by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 19 98th
Population Density # 349 52nd
Diversity Index # 389 47th
Median Household Income # 274 63rd
Per Capita Income # 202 73rd

Additional comparisons and rankings can be made with a VERY EASY TO USE Oklahoma Census Data Comparison Tool.

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