Duncan, IA Demographics

A map of Duncan's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	21	56	100.0%	98.2%
Black	0	0	0.0%	0.0%
Asian	0	0	0.0%	0.0%
Hispanic	0	0	0.0%	0.0%
Native American/Other	0	0	0.0%	0.0%
Multiracial	0	1	0.0%	1.8%

Duncan, Iowa has an estimated population of 21, a dramatic decrease from the 57 recorded in the 2020 Census. The population is 100.0% White, 0.0% Black, 0.0% Asian, 0.0% Hispanic, 0.0% Native American/Other, and 0.0% Multiracial. 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 Iowa 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 3.5% in 2020 and 0.0% in the most recent ACS estimates.

Duncan is ranked the 1000th most populous place in Iowa, out of 1,026 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 943rd most populous place in the 2020 Census.

Duncan's White Population

21 residents of Duncan, or 100.0% of the population, identify as White. The share of White residents in Duncan is significantly higher than in Iowa overall, where 82.3% of the population is White. Duncan ranks 46th statewide in terms of White residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Duncan's White population has declined by an estimated 62.5%. White residents' share of Duncan's population has increased from 98.2% to 100.0%.

Duncan is more White than neighboring Hayfield (0% White), Britt (85.9% White), Garner (94% White), and Klemme (86.9% White).

Duncan's Black Population

0 residents of Duncan, or 0.0% of the population, identify as Black. The share of Black residents in Duncan is slightly lower than in Iowa overall, where 3.8% of the population is Black. Duncan ranks 600th statewide in terms of Black residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Duncan's Black population has grown from 0 to an estimated 0. Black residents' share of Duncan's population has remained roughly unchanged at 0.0%.

Duncan is less Black than neighboring Garner (1% Black).

Duncan's Asian Population

0 residents of Duncan, or 0.0% of the population, identify as Asian. The share of Asian residents in Duncan is slightly lower than in Iowa overall, where 2.5% of the population is Asian. Duncan ranks 543rd statewide in terms of Asian residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Duncan's Asian population has grown from 0 to an estimated 0. Asian residents' share of Duncan's population has remained roughly unchanged at 0.0%.

Duncan is less Asian than neighboring Britt (4% Asian).

Duncan's Hispanic Population

0 residents of Duncan, or 0.0% of the population, identify as Hispanic. The share of Hispanic residents in Duncan is lower than in Iowa overall, where 7.3% of the population is Hispanic. Duncan ranks 933rd statewide in terms of Hispanic residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Duncan's Hispanic population has grown from 0 to an estimated 0. Hispanic residents' share of Duncan's population has remained roughly unchanged at 0.0%.

Duncan is less Hispanic than neighboring Britt (8% Hispanic), Garner (2% Hispanic), and Klemme (12.1% Hispanic).

Duncan's Native American/Other Population

0 residents of Duncan, or 0.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Duncan is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Duncan ranks 637th statewide in terms of Native American/Other residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Duncan's Native American/Other population has grown from 0 to an estimated 0. Native American/Other residents' share of Duncan's population has remained roughly unchanged at 0.0%.

Duncan is less Native American/Other than neighboring Britt (1.4% Native American/Other), and Garner (0.1% Native American/Other).

Duncan's Multiracial Population

0 residents of Duncan, or 0.0% of the population, identify as Multiracial. The share of Multiracial residents in Duncan is slightly lower than in Iowa overall, where 3.5% of the population is Multiracial. Duncan ranks 757th statewide in terms of Multiracial residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Duncan's Multiracial population has declined by an estimated 100.0%. Multiracial residents' share of Duncan's population has decreased from 1.8% to 0.0%.

Duncan is less Multiracial than neighboring Britt (0.7% Multiracial), Garner (2.9% Multiracial), and Klemme (0.9% 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.