Demographics · CA
Fairfield, CA demographics: 120,785 residents, with a median age of 36.9 years, from the U.S. Census Bureau's American Community Survey 2020–2024 (5-year estimates).
120,785people live in Fairfield, at a median age of 36.9 years (American Community Survey 2020–2024, a 5-year average)
Median age 36.9 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 Fairfield, the largest race group is White (32.2%); 32.7% of residents are Hispanic or Latino (of any race); 23.3% were born outside the United States.
ACS 2020–2024 · B01001 / B01002
The median age in Fairfield is 36.9 years (±0.6), younger than the U.S. median of 38.9 years. The population is 49.9% male and 50.1% female. The largest age band is 5 to 17 at 17.6%.
| Age band | People | Share | ± margin |
|---|---|---|---|
| Under 5 | 7,805 | 6.5% | ±644 |
| 5 to 17 | 21,279 | 17.6% | ±1,102 |
| 18 to 24 | 11,177 | 9.3% | ±825 |
| 25 to 34 | 16,861 | 14.0% | ±870 |
| 35 to 44 | 17,219 | 14.3% | ±918 |
| 45 to 54 | 14,477 | 12.0% | ±801 |
| 55 to 64 | 13,916 | 11.5% | ±788 |
| 65 to 74 | 10,560 | 8.7% | ±728 |
| 75 and over | 7,491 | 6.2% | ±618 |
Median age by sex: 36.2 (male) · 38.1 (female).
Shares may not sum to 100% due to rounding. 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 Fairfield is White at 32.2% of the population. Separately, 32.7% 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 | 38,871 | 32.2% | ±1,935 |
| Black or African American alone | 17,469 | 14.5% | ±1,580 |
| American Indian & Alaska Native alone | 864 | 0.7% | ±307 |
| Asian alone | 21,843 | 18.1% | ±1,357 |
| Native Hawaiian & Pacific Islander alone | 1,726 | 1.4% | ±543 |
| Some other race alone | 18,579 | 15.4% | ±1,961 |
| Two or more races | 21,433 | 17.7% | ±1,760 |
| Hispanic or Latino (of any race) | 39,556 | 32.7% | ±1,614 |
Race shares may not sum to 100% due to rounding; race and Hispanic origin are separate questions and are not additive. 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
Fairfield has 38,757 households. 73.6% are family households and 21.0% are people living alone. The average household holds 3.07 people.
Total households
38,757
ACS 2020–2024 5-yr · B11001
Avg household size
3.07
ACS 2020–2024 5-yr · B25010 · ±0.06
Family households
73.6%
Share of all households · B11001
Living alone
21.0%
Share of all households · B11001
| Household type | Households | ± margin |
|---|---|---|
| Total households | 38,757 | ±736 |
| Family households | 28,539 | ±721 |
| Nonfamily households | 10,218 | ±801 |
| Householder living alone | 8,132 | ±712 |
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
23.3% of Fairfield residents were born outside the United States. 64.1% of residents age 5 and over speak only English at home. The most-spoken non-English language at home is Spanish (21.8%).
| Measure | Value | Source / grain |
|---|---|---|
| Foreign-born share | 23.3% | 28,200 people · B05002 |
| Speak only English at home (age 5+) | 64.1% | C16001 |
| Top non-English language at home | 21.8% | Spanish · 24,651 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
26.6% of adults age 25 and over in Fairfield 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+) | 26.6% | 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 Fairfield is 0623182. 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/.