Ontario, CA Demographics

A map of Ontario's Population by Race

Ontario, California has an estimated population of 180,547, an increase from the 175,265 recorded in the 2020 Census. The population is 68.6% Hispanic, 12.3% White, 9.6% Asian, 5.8% Black, 2.9% Multiracial, and 0.8% Native American/Other. This demographic dot map shows the population of Ontario, with one dot drawn for each person counted by the Census, color-coded by race.

Ontario is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than California overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Ontario, that probability was 50.1% in 2020 and 50.1% in the most recent ACS estimates.

Ontario is ranked the 25th most populous place in California, out of 1,618 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). Ontario was ranked the 27th most populous place in the 2020 Census.

Ontario's White Population

22,296 residents of Ontario, or 12.3% of the population, identify as White. The share of White residents in Ontario is significantly lower than in California overall, where 33.8% of the population is White. Ontario ranks 1384th statewide in terms of White residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Ontario's White population has declined by an estimated 7.1%. White residents' share of Ontario's population has decreased from 13.7% to 12.3%.

Ontario is more White than neighboring Montclair (9.7% White). Ontario is less White than neighboring Chino (16.7% White), Eastvale (16.8% White), Rancho Cucamonga (33.4% White), and Upland (34.2% White).

Ontario's Black Population

10,450 residents of Ontario, or 5.8% of the population, identify as Black. The share of Black residents in Ontario is comparable to the share in California overall, where 5.2% of the population is Black. Ontario ranks 175th statewide in terms of Black residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Ontario's Black population has grown by an estimated 1.1%. Black residents' share of Ontario's population has remained roughly unchanged at 5.8%.

Ontario is less Black than neighboring Chino (7.4% Black), Eastvale (7.4% Black), Rancho Cucamonga (8.3% Black), Upland (5.9% Black), and Montclair (5.9% Black).

Ontario's Asian Population

17,309 residents of Ontario, or 9.6% of the population, identify as Asian. The share of Asian residents in Ontario is lower than in California overall, where 15.3% of the population is Asian. Ontario ranks 329th statewide in terms of Asian residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Ontario's Asian population has grown by an estimated 10.3%. Asian residents' share of Ontario's population has increased from 9.0% to 9.6%.

Ontario is less Asian than neighboring Chino (18.2% Asian), Eastvale (30.8% Asian), Rancho Cucamonga (15% Asian), Upland (11.1% Asian), and Montclair (10.1% Asian).

Ontario's Hispanic Population

123,800 residents of Ontario, or 68.6% of the population, identify as Hispanic. The share of Hispanic residents in Ontario is significantly higher than in California overall, where 40.2% of the population is Hispanic. Ontario ranks 252nd statewide in terms of Hispanic residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Ontario's Hispanic population has grown by an estimated 3.2%. Hispanic residents' share of Ontario's population has remained roughly unchanged at 68.6%.

Ontario is more Hispanic than neighboring Chino (54.3% Hispanic), Eastvale (41.5% Hispanic), Rancho Cucamonga (38.1% Hispanic), and Upland (43.4% Hispanic). Ontario is less Hispanic than neighboring Montclair (72.5% Hispanic).

Ontario's Native American/Other Population

1,534 residents of Ontario, or 0.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Ontario is comparable to the share in California overall, where 1.2% of the population is Native American/Other. Ontario ranks 1022nd statewide in terms of Native American/Other residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Ontario's Native American/Other population has declined by an estimated 12.7%. Native American/Other residents' share of Ontario's population has remained roughly unchanged at 0.8%.

Ontario is more Native American/Other than neighboring Chino (0.4% Native American/Other), and Montclair (0.5% Native American/Other). Ontario is less Native American/Other than neighboring Eastvale (1.7% Native American/Other), Rancho Cucamonga (1.2% Native American/Other), and Upland (1.3% Native American/Other).

Ontario's Multiracial Population

5,158 residents of Ontario, or 2.9% of the population, identify as Multiracial. The share of Multiracial residents in Ontario is comparable to the share in California overall, where 4.4% of the population is Multiracial. Ontario ranks 1327th statewide in terms of Multiracial residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Ontario's Multiracial population has grown by an estimated 45.1%. Multiracial residents' share of Ontario's population has increased from 2.0% to 2.9%.

Ontario is more Multiracial than neighboring Eastvale (1.9% Multiracial), and Montclair (1.3% Multiracial). Ontario is less Multiracial than neighboring Rancho Cucamonga (4% Multiracial), and Upland (4.1% 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.