Duncan, OK Demographics

A map of Duncan's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	16,968	16,205	73.9%	71.4%
Hispanic	2,688	2,465	11.7%	10.9%
Multiracial	1,981	2,082	8.6%	9.2%
Native American/Other	687	1,026	3.0%	4.5%
Black	491	713	2.1%	3.1%
Asian	143	201	0.6%	0.9%

Duncan, Oklahoma has an estimated population of 22,958, a slight increase from the 22,692 recorded in the 2020 Census. The population is 73.9% White, 11.7% Hispanic, 8.6% Multiracial, 3.0% Native American/Other, 2.1% Black, and 0.6% Asian. This demographic dot map shows the population of Duncan, with one dot drawn for each person counted by the Census, color-coded by race.

Duncan has become less racially diverse since the 2020 Census. It is considerably less diverse than Oklahoma overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Duncan, that probability was 46.7% in 2020 and 43.1% in the most recent ACS estimates.

Duncan is ranked the 20th most populous place in Oklahoma, out of 846 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Duncan was ranked the 20th most populous place in the 2020 Census.

Duncan's White Population

16,968 residents of Duncan, or 73.9% of the population, identify as White. The share of White residents in Duncan is considerably higher than in Oklahoma overall, where 62.1% of the population is White. Duncan ranks 312th statewide in terms of White residents as a share of the population, out of 846 places.

Since the 2020 Census, Duncan's White population has grown by an estimated 4.7%. White residents' share of Duncan's population has increased from 71.4% to 73.9%.

Duncan is less White than neighboring Marlow (79.8% White), Bray (80.2% White), Sunray (79.4% White), Empire City (89.5% White), and Central High (83.7% White).

Duncan's Black Population

491 residents of Duncan, or 2.1% of the population, identify as Black. The share of Black residents in Duncan is slightly lower than in Oklahoma overall, where 6.8% of the population is Black. Duncan ranks 140th statewide in terms of Black residents as a share of the population, out of 846 places.

Since the 2020 Census, Duncan's Black population has declined by an estimated 31.1%. Black residents' share of Duncan's population has decreased from 3.1% to 2.1%.

Duncan is more Black than neighboring Marlow (0.2% Black), Bray (0.2% Black), Sunray (0% Black), Empire City (0.4% Black), and Central High (0% Black).

Duncan's Asian Population

143 residents of Duncan, or 0.6% of the population, identify as Asian. The share of Asian residents in Duncan is comparable to the share in Oklahoma overall, where 2.4% of the population is Asian. Duncan ranks 126th statewide in terms of Asian residents as a share of the population, out of 846 places.

Since the 2020 Census, Duncan's Asian population has declined by an estimated 28.9%. Asian residents' share of Duncan's population has remained roughly unchanged at 0.6%.

Duncan is more Asian than neighboring Marlow (0% Asian), Bray (0.2% Asian), Sunray (0% Asian), Empire City (0% Asian), and Central High (0.1% Asian).

Duncan's Hispanic Population

2,688 residents of Duncan, or 11.7% of the population, identify as Hispanic. The share of Hispanic residents in Duncan is comparable to the share in Oklahoma overall, where 12.7% of the population is Hispanic. Duncan ranks 142nd statewide in terms of Hispanic residents as a share of the population, out of 846 places.

Since the 2020 Census, Duncan's Hispanic population has grown by an estimated 9.0%. Hispanic residents' share of Duncan's population has increased from 10.9% to 11.7%.

Duncan is more Hispanic than neighboring Marlow (7.2% Hispanic), Bray (5% Hispanic), Sunray (4.6% Hispanic), Empire City (2.1% Hispanic), and Central High (5.6% Hispanic).

Duncan's Native American/Other Population

687 residents of Duncan, or 3.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Duncan is slightly lower than in Oklahoma overall, where 7.1% of the population is Native American/Other. Duncan ranks 643rd statewide in terms of Native American/Other residents as a share of the population, out of 846 places.

Since the 2020 Census, Duncan's Native American/Other population has declined by an estimated 33.0%. Native American/Other residents' share of Duncan's population has decreased from 4.5% to 3.0%.

Duncan is more Native American/Other than neighboring Marlow (2.6% Native American/Other). Duncan is less Native American/Other than neighboring Bray (6.9% Native American/Other), Sunray (10.4% Native American/Other), Empire City (3.1% Native American/Other), and Central High (3.1% Native American/Other).

Duncan's Multiracial Population

1,981 residents of Duncan, or 8.6% of the population, identify as Multiracial. The share of Multiracial residents in Duncan is comparable to the share in Oklahoma overall, where 8.9% of the population is Multiracial. Duncan ranks 456th statewide in terms of Multiracial residents as a share of the population, out of 846 places.

Since the 2020 Census, Duncan's Multiracial population has declined by an estimated 4.9%. Multiracial residents' share of Duncan's population has decreased from 9.2% to 8.6%.

Duncan is more Multiracial than neighboring Bray (7.5% Multiracial), Sunray (5.6% Multiracial), Empire City (4.8% Multiracial), and Central High (7.5% Multiracial). Duncan is less Multiracial than neighboring Marlow (10.2% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.