Ontario, WI Demographics

A map of Ontario's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	359	484	85.1%	90.6%
Hispanic	57	29	13.5%	5.4%
Multiracial	6	12	1.4%	2.2%
Black	0	1	0.0%	0.2%
Asian	0	7	0.0%	1.3%
Native American/Other	0	1	0.0%	0.2%

Ontario, Wisconsin has an estimated population of 422, a large decrease from the 534 recorded in the 2020 Census. The population is 85.1% White, 13.5% Hispanic, 1.4% Multiracial, 0.0% Black, 0.0% Asian, and 0.0% 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 has become considerably more racially diverse since the 2020 Census. It is considerably less diverse than Wisconsin 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 17.5% in 2020 and 25.8% in the most recent ACS estimates.

Ontario is ranked the 567th most populous place in Wisconsin, out of 808 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 519th most populous place in the 2020 Census.

Ontario's White Population

359 residents of Ontario, or 85.1% of the population, identify as White. The share of White residents in Ontario is higher than in Wisconsin overall, where 78.6% of the population is White. Ontario ranks 411th statewide in terms of White residents as a share of the population, out of 808 places.

Since the 2020 Census, Ontario's White population has declined by an estimated 25.8%. White residents' share of Ontario's population has decreased from 90.6% to 85.1%.

Ontario is more White than neighboring Norwalk (40.3% White), and Cashton (64.9% White). Ontario is less White than neighboring Wilton (89.3% White), La Farge (96.5% White), and Melvina (100% White).

Ontario's Black Population

0 residents of Ontario, or 0.0% of the population, identify as Black. The share of Black residents in Ontario is lower than in Wisconsin overall, where 5.9% of the population is Black. Ontario ranks 542nd statewide in terms of Black residents as a share of the population, out of 808 places.

Since the 2020 Census, Ontario's Black population has declined by an estimated 100.0%. Black residents' share of Ontario's population has remained roughly unchanged at 0.0%.

Ontario is less Black than neighboring Wilton (1.5% Black), Norwalk (1.2% Black), and Cashton (1.8% Black).

Ontario's Asian Population

0 residents of Ontario, or 0.0% of the population, identify as Asian. The share of Asian residents in Ontario is slightly lower than in Wisconsin overall, where 2.9% of the population is Asian. Ontario ranks 149th statewide in terms of Asian residents as a share of the population, out of 808 places.

Since the 2020 Census, Ontario's Asian population has declined by an estimated 100.0%. Asian residents' share of Ontario's population has decreased from 1.3% to 0.0%.

Ontario's Hispanic Population

57 residents of Ontario, or 13.5% of the population, identify as Hispanic. The share of Hispanic residents in Ontario is higher than in Wisconsin overall, where 8% of the population is Hispanic. Ontario ranks 177th statewide in terms of Hispanic residents as a share of the population, out of 808 places.

Since the 2020 Census, Ontario's Hispanic population has grown by an estimated 96.6%. Hispanic residents' share of Ontario's population has increased from 5.4% to 13.5%.

Ontario is more Hispanic than neighboring Wilton (2.3% Hispanic), La Farge (0.9% Hispanic), and Melvina (0% Hispanic). Ontario is less Hispanic than neighboring Norwalk (58.2% Hispanic), and Cashton (31.2% Hispanic).

Ontario's Native American/Other Population

0 residents of Ontario, 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 Ontario is comparable to the share in Wisconsin overall, where 0.9% of the population is Native American/Other. Ontario ranks 659th statewide in terms of Native American/Other residents as a share of the population, out of 808 places.

Since the 2020 Census, Ontario's Native American/Other population has declined by an estimated 100.0%. Native American/Other residents' share of Ontario's population has remained roughly unchanged at 0.0%.

Ontario is less Native American/Other than neighboring Norwalk (0.3% Native American/Other), and La Farge (0.2% Native American/Other).

Ontario's Multiracial Population

6 residents of Ontario, or 1.4% of the population, identify as Multiracial. The share of Multiracial residents in Ontario is slightly lower than in Wisconsin overall, where 3.7% of the population is Multiracial. Ontario ranks 602nd statewide in terms of Multiracial residents as a share of the population, out of 808 places.

Since the 2020 Census, Ontario's Multiracial population has declined by an estimated 50.0%. Multiracial residents' share of Ontario's population has decreased from 2.2% to 1.4%.

Ontario is more Multiracial than neighboring Norwalk (0% Multiracial), and Melvina (0% Multiracial). Ontario is less Multiracial than neighboring Wilton (7% Multiracial), La Farge (2.4% Multiracial), and Cashton (2.1% 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.