Onslow, IA Demographics

A map of Onslow's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	258	165	90.8%	82.1%
Black	13	10	4.6%	5.0%
Hispanic	8	6	2.8%	3.0%
Native American/Other	5	0	1.8%	0.0%
Asian	0	0	0.0%	0.0%
Multiracial	0	20	0.0%	10.0%

Onslow, Iowa has an estimated population of 284, a dramatic increase from the 201 recorded in the 2020 Census. The population is 90.8% White, 4.6% Black, 2.8% Hispanic, 1.8% Native American/Other, 0.0% Asian, and 0.0% Multiracial. This demographic dot map shows the population of Onslow, with one dot drawn for each person counted by the Census, color-coded by race.

Onslow has become considerably 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 Onslow, that probability was 31.3% in 2020 and 17.2% in the most recent ACS estimates.

Onslow is ranked the 618th 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). Onslow was ranked the 684th most populous place in the 2020 Census.

Onslow's White Population

258 residents of Onslow, or 90.8% of the population, identify as White. The share of White residents in Onslow is higher than in Iowa overall, where 82.3% of the population is White. Onslow ranks 940th statewide in terms of White residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Onslow's White population has grown by an estimated 56.4%. White residents' share of Onslow's population has increased from 82.1% to 90.8%.

Onslow is more White than neighboring Wyoming (90.5% White), and Olin (76.5% White). Onslow is less White than neighboring Center Junction (100% White), Monmouth (100% White), and Oxford Junction (97.6% White).

Onslow's Black Population

13 residents of Onslow, or 4.6% of the population, identify as Black. The share of Black residents in Onslow is comparable to the share in Iowa overall, where 3.8% of the population is Black. Onslow ranks 25th statewide in terms of Black residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Onslow's Black population has grown by an estimated 30.0%. Black residents' share of Onslow's population has remained roughly unchanged at 4.6%.

Onslow is more Black than neighboring Wyoming (0% Black), Center Junction (0% Black), Monmouth (0% Black), and Oxford Junction (0% Black). Onslow is less Black than neighboring Olin (9.2% Black).

Onslow's Asian Population

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

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

Onslow is less Asian than neighboring Olin (1% Asian).

Onslow's Hispanic Population

8 residents of Onslow, or 2.8% of the population, identify as Hispanic. The share of Hispanic residents in Onslow is slightly lower than in Iowa overall, where 7.3% of the population is Hispanic. Onslow ranks 433rd statewide in terms of Hispanic residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Onslow's Hispanic population has grown by an estimated 33.3%. Hispanic residents' share of Onslow's population has remained roughly unchanged at 2.8%.

Onslow is more Hispanic than neighboring Center Junction (0% Hispanic), Monmouth (0% Hispanic), Oxford Junction (0% Hispanic), and Olin (0.6% Hispanic). Onslow is less Hispanic than neighboring Wyoming (4.6% Hispanic).

Onslow's Native American/Other Population

5 residents of Onslow, or 1.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Onslow is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Onslow 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, Onslow's Native American/Other population has grown from 0 to an estimated 5. Native American/Other residents' share of Onslow's population has increased from 0.0% to 1.8%.

Onslow is more Native American/Other than neighboring Wyoming (0.4% Native American/Other), Center Junction (0% Native American/Other), Monmouth (0% Native American/Other), Oxford Junction (0% Native American/Other), and Olin (0.7% Native American/Other).

Onslow's Multiracial Population

0 residents of Onslow, or 0.0% of the population, identify as Multiracial. The share of Multiracial residents in Onslow is slightly lower than in Iowa overall, where 3.5% of the population is Multiracial. Onslow ranks 17th statewide in terms of Multiracial residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Onslow's Multiracial population has declined by an estimated 100.0%. Multiracial residents' share of Onslow's population has decreased from 10.0% to 0.0%.

Onslow is less Multiracial than neighboring Wyoming (4.6% Multiracial), Oxford Junction (2.4% Multiracial), and Olin (12% 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.