Demographics · CA
Ontario, CA demographics: 180,547 residents, with a median age of 33.5 years, from the U.S. Census Bureau's American Community Survey 2020–2024 (5-year estimates).
180,547 people live in Ontario, at a median age of 33.5 years (American Community Survey 2020–2024, a 5-year average)
Median age 33.5 years — younger than the U.S. median of 38.9.
ACS 2020–2024 5-year · ACS 5-Year Estimates 2020-2024 (released 2026-01-29)
In Ontario, the largest race group is Some other race (32.3%); 68.6% of residents are Hispanic or Latino (of any race); 27.7% were born outside the United States.
ACS 2020–2024 · B01001 / B01002
The median age in Ontario is 33.5 years (±0.7), younger than the U.S. median of 38.9 years. The population is 48.8% male and 51.2% female. The largest age band is 5 to 17 at 18.0%.
| Age band | People | Share | ± margin |
|---|---|---|---|
| Under 5 | 11,557 | 6.4% | ±901 |
| 5 to 17 | 32,560 | 18.0% | ±1,552 |
| 18 to 24 | 18,564 | 10.3% | ±1,228 |
| 25 to 34 | 31,250 | 17.3% | ±1,455 |
| 35 to 44 | 25,966 | 14.4% | ±1,347 |
| 45 to 54 | 21,570 | 11.9% | ±1,181 |
| 55 to 64 | 20,210 | 11.2% | ±1,117 |
| 65 to 74 | 12,711 | 7.0% | ±1,003 |
| 75 and over | 6,159 | 3.4% | ±487 |
Median age by sex: 33.6 (male) · 33.3 (female).
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B01001 sex by age, B01002 median age) · place-grain · margins of error at the 90% confidence level · methodology →
ACS 2020–2024 · B02001 / B03003
The largest race group in Ontario is Some other race at 32.3% of the population. Separately, 68.6% of residents are Hispanic or Latino of any race. Race and Hispanic origin are two different questions on the census form, so their shares are reported separately and are not additive.
| Race (alone, or two or more) | People | Share | ± margin |
|---|---|---|---|
| White alone | 36,639 | 20.3% | ±2,044 |
| Black or African American alone | 11,358 | 6.3% | ±1,630 |
| American Indian & Alaska Native alone | 3,846 | 2.1% | ±893 |
| Asian alone | 17,716 | 9.8% | ±1,431 |
| Native Hawaiian & Pacific Islander alone | 517 | 0.3% | ±303 · low precision |
| Some other race alone | 58,388 | 32.3% | ±3,265 |
| Two or more races | 52,083 | 28.8% | ±3,075 |
| Hispanic or Latino (of any race) | 123,800 | 68.6% | ±2,559 |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B02001 race, B03003 Hispanic or Latino origin) · place-grain · margins of error at the 90% confidence level · methodology →
ACS 2020–2024 · B11001 / B25010
Ontario has 53,770 households. 78.0% are family households and 16.2% are people living alone. The average household holds 3.34 people.
Total households
53,770
ACS 2020–2024 5-yr · B11001
Avg household size
3.34
ACS 2020–2024 5-yr · B25010 · ±0.06
Family households
78.0%
Share of all households · B11001
Living alone
16.2%
Share of all households · B11001
| Household type | Households | ± margin |
|---|---|---|
| Total households | 53,770 | ±1,018 |
| Family households | 41,927 | ±847 |
| Nonfamily households | 11,843 | ±1,141 |
| Householder living alone | 8,684 | ±1,000 |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B11001 household type, B25010 average household size) · place-grain · methodology →
ACS 2020–2024 · B05002 / C16001
27.7% of Ontario residents were born outside the United States. 44.9% of residents age 5 and over speak only English at home. The most-spoken non-English language at home is Spanish (46.5%).
| Measure | Value | Source / grain |
|---|---|---|
| Foreign-born share | 27.7% | 50,086 people · B05002 |
| Speak only English at home (age 5+) | 44.9% | C16001 |
| Top non-English language at home | 46.5% | Spanish · 78,555 speakers · C16001 |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B05002 place of birth, C16001 language spoken at home) · place-grain · methodology →
ACS 2020–2024 · B15003
22.5% of adults age 25 and over in Ontario hold a bachelor's degree or higher (the U.S. share is about 35%).
| Measure | Value | Source / grain |
|---|---|---|
| Bachelor's degree or higher (age 25+) | 22.5% | B15003 lines 22–25 over line 1 · place-grain |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B15003 educational attainment, population 25+) · place-grain · methodology →
Sources · provenance
The GEOID for Ontario is 0653896. Every figure on this page is a place-grain American Community Survey 5-Year 2020–2024 estimate (ACS 5-Year Estimates 2020-2024 (released 2026-01-29)) shown with its margin of error. Full per-dataset detail: /sources/.