Fairfield, California demographics

Fairfield, CA demographics: median age 36.9; 26.6% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Fairfield city, California · Incorporated city · GEOID 0623182. The survey estimates a population of 120,785 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Fairfield is 36.9 years, with a 90% margin of error of 0.6 years. There are 38,757 households (±736). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	36.9 ±0.6	37.9 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 120,785
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Under 18	29,084 ±1,276	24.1% ±1.1 pp	22.0%	22.0%
18–34	28,038 ±1,199	23.2% ±1.0 pp	23.9%	22.8%
35–64	45,612 ±1,451	37.8% ±1.2 pp	38.5%	38.0%
65 and older	18,051 ±955	14.9% ±0.8 pp	15.7%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 120,785
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Male	60,268 ±948	49.9% ±0.8 pp	49.9%	49.5%
Female	60,517 ±950	50.1% ±0.8 pp	50.1%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 120,785
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
White alone	38,871 ±1,935	32.2% ±1.6 pp	39.7%	61.0%
Black or African American alone	17,469 ±1,580	14.5% ±1.3 pp	5.4%	12.2%
American Indian and Alaska Native alone	864 ±307	0.7% ±0.3 pp	1.3%	0.9%
Asian alone	21,843 ±1,357	18.1% ±1.1 pp	15.5%	6.0%
Native Hawaiian and Other Pacific Islander alone	1,726 ±543	1.4% ±0.4 pp	0.4%	0.2%
Some other race alone	18,579 ±1,961	15.4% ±1.6 pp	18.5%	7.1%
Two or more races	21,433 ±1,760	17.7% ±1.5 pp	19.2%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 120,785
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Not Hispanic or Latino	81,229 ±1,621	67.3% ±1.3 pp	59.8%	80.7%
Hispanic or Latino	39,556 ±1,614	32.7% ±1.3 pp	40.2%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 38,757
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Married-couple family	20,640 ±813	53.3% ±1.8 pp	48.4%	46.9%
Other family: male householder, no spouse present	2,333 ±383	6.0% ±1.0 pp	6.3%	5.1%
Other family: female householder, no spouse present	5,566 ±510	14.4% ±1.3 pp	13.1%	12.2%
Nonfamily: householder living alone	8,132 ±712	21.0% ±1.8 pp	24.3%	28.7%
Nonfamily: householder not living alone	2,086 ±367	5.4% ±0.9 pp	7.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 38,757
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Households with people under 18	13,958 ±624	36.0% ±1.5 pp	32.4%	29.5%
Households without people under 18	24,799 ±934	64.0% ±2.1 pp	67.6%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 38,757
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
One-person nonfamily households	8,132 ±712	21.0% ±1.8 pp	24.3%	28.7%
Two-person households	11,152 ±742	28.8% ±1.8 pp	30.5%	33.8%
Three-person households	6,893 ±614	17.8% ±1.5 pp	16.7%	15.3%
Four-person households	6,144 ±519	15.9% ±1.3 pp	14.9%	12.6%
Five-person households	3,696 ±502	9.5% ±1.3 pp	7.7%	5.9%
Six-person households	1,555 ±289	4.0% ±0.7 pp	3.3%	2.2%
Seven or more people	1,185 ±288	3.1% ±0.7 pp	2.6%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 120,785
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Native	92,585 ±1,361	76.7% ±1.1 pp	73.0%	85.9%
Foreign born	28,200 ±1,362	23.3% ±1.1 pp	27.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 112,980
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
English only	72,433 ±2,070	64.1% ±1.8 pp	55.6%	77.7%
Spanish	24,651 ±1,463	21.8% ±1.3 pp	28.3%	13.6%
French, Haitian, or Cajun	234 ±130 · low precision	0.2% ±0.1 pp · low precision	0.4%	0.7%
German or other West Germanic	353 ±213 · low precision	0.3% ±0.2 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	556 ±304 · low precision	0.5% ±0.3 pp · low precision	0.7%	0.7%
Other Indo-European	2,464 ±800	2.2% ±0.7 pp	3.5%	2.0%
Korean	239 ±110	0.2% ±0.1 pp	1.0%	0.3%
Chinese, including Mandarin and Cantonese	1,231 ±363	1.1% ±0.3 pp	3.5%	1.1%
Vietnamese	567 ±268	0.5% ±0.2 pp	1.5%	0.5%
Tagalog, including Filipino	7,069 ±870	6.3% ±0.8 pp	2.1%	0.6%
Other Asian and Pacific Island	2,610 ±540	2.3% ±0.5 pp	2.0%	1.1%
Arabic	241 ±166 · low precision	0.2% ±0.1 pp · low precision	0.6%	0.5%
Other and unspecified	332 ±184 · low precision	0.3% ±0.2 pp · low precision	0.6%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 80,524
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Less than high school graduate	10,825 ±970	13.4% ±1.2 pp	15.3%	10.4%
High school graduate or equivalency	19,799 ±1,267	24.6% ±1.5 pp	20.5%	26.0%
Some college, no degree	20,023 ±1,184	24.9% ±1.4 pp	19.3%	19.1%
Associate’s degree	8,460 ±794	10.5% ±1.0 pp	7.9%	8.8%
Bachelor’s degree	14,107 ±917	17.5% ±1.1 pp	22.7%	21.6%
Graduate or professional degree	7,310 ±667	9.1% ±0.8 pp	14.4%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 119,298
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Same house	106,003 ±1,510	88.9% ±1.2 pp	89.2%	87.7%
Moved within same county	6,748 ±1,018	5.7% ±0.9 pp	6.4%	6.3%
Moved from a different county in the same state	3,699 ±676	3.1% ±0.6 pp	2.6%	3.1%
Moved from a different state	1,680 ±506	1.4% ±0.4 pp	1.1%	2.3%
Moved from abroad	1,168 ±502	1.0% ±0.4 pp	0.7%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

5.8% of Fairfield residents (±0.8 percentage points) had no health insurance coverage when surveyed, compared with 6.6% in California and 8.4% nationally. 92.5% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Fairfield	California	U.S.	Compared with California
People without health insurance Civilian noninstitutionalized population	5.8% ±0.8 pp	6.6%	8.4%	Lower
Households with a broadband subscription Households	92.5% ±1.1 pp	93.5%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	7.9% ±0.7 pp	4.3%	6.2%	Higher

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Fairfield . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Fairfield housing and cost context or return to the city profile.