Eureka, California demographics

Eureka, CA demographics: median age 39.1; 29.0% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Eureka city, California · Incorporated city · GEOID 0623042. The survey estimates a population of 26,010 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Eureka is 39.1 years, with a 90% margin of error of 1.8 years. There are 10,392 households (±498). 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	39.1 ±1.8	37.9 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 26,010
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Under 18	5,010 ±613	19.3% ±2.4 pp	22.0%	22.0%
18–34	6,206 ±725	23.9% ±2.8 pp	23.9%	22.8%
35–64	10,454 ±818	40.2% ±3.1 pp	38.5%	38.0%
65 and older	4,340 ±470	16.7% ±1.8 pp	15.7%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 26,010
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Male	13,061 ±517	50.2% ±2.0 pp	49.9%	49.5%
Female	12,949 ±520	49.8% ±2.0 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: 26,010
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
White alone	17,746 ±697	68.2% ±2.7 pp	39.7%	61.0%
Black or African American alone	730 ±252	2.8% ±1.0 pp	5.4%	12.2%
American Indian and Alaska Native alone	531 ±189	2.0% ±0.7 pp	1.3%	0.9%
Asian alone	1,448 ±435	5.6% ±1.7 pp	15.5%	6.0%
Native Hawaiian and Other Pacific Islander alone	236 ±223 · low precision	0.9% ±0.9 pp · low precision	0.4%	0.2%
Some other race alone	1,558 ±510	6.0% ±2.0 pp	18.5%	7.1%
Two or more races	3,761 ±669	14.5% ±2.6 pp	19.2%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 26,010
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Not Hispanic or Latino	21,884 ±643	84.1% ±2.5 pp	59.8%	80.7%
Hispanic or Latino	4,126 ±650	15.9% ±2.5 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: 10,392
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Married-couple family	3,333 ±394	32.1% ±3.5 pp	48.4%	46.9%
Other family: male householder, no spouse present	672 ±242	6.5% ±2.3 pp	6.3%	5.1%
Other family: female householder, no spouse present	1,297 ±254	12.5% ±2.4 pp	13.1%	12.2%
Nonfamily: householder living alone	3,732 ±499	35.9% ±4.5 pp	24.3%	28.7%
Nonfamily: householder not living alone	1,358 ±246	13.1% ±2.3 pp	7.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 10,392
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Households with people under 18	2,300 ±314	22.1% ±2.8 pp	32.4%	29.5%
Households without people under 18	8,092 ±593	77.9% ±4.3 pp	67.6%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 10,392
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
One-person nonfamily households	3,732 ±499	35.9% ±4.5 pp	24.3%	28.7%
Two-person households	3,667 ±485	35.3% ±4.4 pp	30.5%	33.8%
Three-person households	1,271 ±283	12.2% ±2.7 pp	16.7%	15.3%
Four-person households	861 ±246	8.3% ±2.3 pp	14.9%	12.6%
Five-person households	405 ±148	3.9% ±1.4 pp	7.7%	5.9%
Six-person households	281 ±155 · low precision	2.7% ±1.5 pp · low precision	3.3%	2.2%
Seven or more people	175 ±103 · low precision	1.7% ±1.0 pp · low precision	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: 26,010
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Native	24,058 ±613	92.5% ±2.4 pp	73.0%	85.9%
Foreign born	1,952 ±616	7.5% ±2.4 pp	27.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 24,615
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
English only	21,243 ±768	86.3% ±3.0 pp	55.6%	77.7%
Spanish	1,816 ±570	7.4% ±2.3 pp	28.3%	13.6%
French, Haitian, or Cajun	34 ±44 · low precision	0.1% ±0.2 pp · low precision	0.4%	0.7%
German or other West Germanic	28 ±28 · low precision	0.1% ±0.1 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	59 ±50 · low precision	0.2% ±0.2 pp · low precision	0.7%	0.7%
Other Indo-European	246 ±228 · low precision	1.0% ±0.9 pp · low precision	3.5%	2.0%
Korean	78 ±101 · low precision	0.3% ±0.4 pp · low precision	1.0%	0.3%
Chinese, including Mandarin and Cantonese	199 ±138 · low precision	0.8% ±0.6 pp · low precision	3.5%	1.1%
Vietnamese	249 ±312 · low precision	1.0% ±1.3 pp · low precision	1.5%	0.5%
Tagalog, including Filipino	42 ±49 · low precision	0.2% ±0.2 pp · low precision	2.1%	0.6%
Other Asian and Pacific Island	532 ±210	2.2% ±0.9 pp	2.0%	1.1%
Arabic	0 ±25 · low precision	0.0% ±0.1 pp · low precision	0.6%	0.5%
Other and unspecified	89 ±78 · low precision	0.4% ±0.3 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: 18,589
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Less than high school graduate	1,868 ±430	10.0% ±2.3 pp	15.3%	10.4%
High school graduate or equivalency	4,297 ±589	23.1% ±3.0 pp	20.5%	26.0%
Some college, no degree	5,082 ±645	27.3% ±3.3 pp	19.3%	19.1%
Associate’s degree	1,944 ±392	10.5% ±2.1 pp	7.9%	8.8%
Bachelor’s degree	3,651 ±473	19.6% ±2.4 pp	22.7%	21.6%
Graduate or professional degree	1,747 ±341	9.4% ±1.8 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: 25,886
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Same house	21,634 ±856	83.6% ±3.3 pp	89.2%	87.7%
Moved within same county	2,227 ±598	8.6% ±2.3 pp	6.4%	6.3%
Moved from a different county in the same state	1,762 ±566	6.8% ±2.2 pp	2.6%	3.1%
Moved from a different state	221 ±121 · low precision	0.9% ±0.5 pp · low precision	1.1%	2.3%
Moved from abroad	42 ±55 · low precision	0.2% ±0.2 pp · low precision	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

5.9% of Eureka residents (±1.6 percentage points) had no health insurance coverage when surveyed, compared with 6.6% in California and 8.4% nationally. 91.5% 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	Eureka	California	U.S.	Compared with California
People without health insurance Civilian noninstitutionalized population	5.9% ±1.6 pp	6.6%	8.4%	Not statistically different
Households with a broadband subscription Households	91.5% ±1.9 pp	93.5%	91.0%	Lower
Veterans Civilian population age 18 and older	7.1% ±1.7 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 Eureka . 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 Eureka housing and cost context or return to the city profile.