Onset, MA Demographics

A map of Onset's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	953	1,230	69.1%	76.1%
Hispanic	272	41	19.7%	2.5%
Multiracial	155	175	11.2%	10.8%
Black	0	57	0.0%	3.5%
Asian	0	16	0.0%	1.0%
Native American/Other	0	98	0.0%	6.1%

Onset, Massachusetts has an estimated population of 1,380, a large decrease from the 1,617 recorded in the 2020 Census. The population is 69.1% White, 19.7% Hispanic, 11.2% Multiracial, 0.0% Black, 0.0% Asian, and 0.0% Native American/Other. This demographic dot map shows the population of Onset, with one dot drawn for each person counted by the Census, color-coded by race.

Onset has become considerably more racially diverse since the 2020 Census. It is considerably less diverse than Massachusetts overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Onset, that probability was 40.4% in 2020 and 47.2% in the most recent ACS estimates.

Onset is ranked the 213th most populous place in Massachusetts, out of 248 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). Onset was ranked the 206th most populous place in the 2020 Census.

Onset's White Population

953 residents of Onset, or 69.1% of the population, identify as White. The share of White residents in Onset is slightly higher than in Massachusetts overall, where 66.6% of the population is White. Onset ranks 185th statewide in terms of White residents as a share of the population, out of 248 places.

Since the 2020 Census, Onset's White population has declined by an estimated 22.5%. White residents' share of Onset's population has decreased from 76.1% to 69.1%.

Onset is less White than neighboring White Island Shores (87.7% White), Bourne (98.8% White), Wareham Center (89.5% White), Buzzards Bay (88.7% White), and Pocasset (95.8% White).

Onset's Black Population

0 residents of Onset, or 0.0% of the population, identify as Black. The share of Black residents in Onset is lower than in Massachusetts overall, where 6.4% of the population is Black. Onset ranks 64th statewide in terms of Black residents as a share of the population, out of 248 places.

Since the 2020 Census, Onset's Black population has declined by an estimated 100.0%. Black residents' share of Onset's population has decreased from 3.5% to 0.0%.

Onset is less Black than neighboring Wareham Center (5.6% Black), and Buzzards Bay (0.2% Black).

Onset's Asian Population

0 residents of Onset, or 0.0% of the population, identify as Asian. The share of Asian residents in Onset is lower than in Massachusetts overall, where 7.3% of the population is Asian. Onset ranks 180th statewide in terms of Asian residents as a share of the population, out of 248 places.

Since the 2020 Census, Onset's Asian population has declined by an estimated 100.0%. Asian residents' share of Onset's population has decreased from 1.0% to 0.0%.

Onset is less Asian than neighboring Buzzards Bay (2.8% Asian), and Pocasset (0.4% Asian).

Onset's Hispanic Population

272 residents of Onset, or 19.7% of the population, identify as Hispanic. The share of Hispanic residents in Onset is higher than in Massachusetts overall, where 13.3% of the population is Hispanic. Onset ranks 201st statewide in terms of Hispanic residents as a share of the population, out of 248 places.

Since the 2020 Census, Onset's Hispanic population has grown by an estimated 563.4%. Hispanic residents' share of Onset's population has increased from 2.5% to 19.7%.

Onset is more Hispanic than neighboring White Island Shores (0% Hispanic), Bourne (0.2% Hispanic), Wareham Center (0.1% Hispanic), Buzzards Bay (2.3% Hispanic), and Pocasset (1.8% Hispanic).

Onset's Native American/Other Population

0 residents of Onset, 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 Onset is comparable to the share in Massachusetts overall, where 1.3% of the population is Native American/Other. Onset ranks 6th statewide in terms of Native American/Other residents as a share of the population, out of 248 places.

Since the 2020 Census, Onset's Native American/Other population has declined by an estimated 100.0%. Native American/Other residents' share of Onset's population has decreased from 6.1% to 0.0%.

Onset is less Native American/Other than neighboring White Island Shores (2% Native American/Other), Wareham Center (0.9% Native American/Other), Buzzards Bay (0.2% Native American/Other), and Pocasset (1.3% Native American/Other).

Onset's Multiracial Population

155 residents of Onset, or 11.2% of the population, identify as Multiracial. The share of Multiracial residents in Onset is higher than in Massachusetts overall, where 5.1% of the population is Multiracial. Onset ranks 5th statewide in terms of Multiracial residents as a share of the population, out of 248 places.

Since the 2020 Census, Onset's Multiracial population has declined by an estimated 11.4%. Multiracial residents' share of Onset's population has remained roughly unchanged at 11.2%.

Onset is more Multiracial than neighboring White Island Shores (10.3% Multiracial), Bourne (1% Multiracial), Wareham Center (3.9% Multiracial), Buzzards Bay (5.8% Multiracial), and Pocasset (0.7% 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.