Seaside, California demographics

Seaside, CA demographics: median age 34.0; 29.6% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Seaside city, California · Incorporated city · GEOID 0670742. The survey estimates a population of 31,814 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Seaside is 34.0 years, with a 90% margin of error of 1.5 years. There are 10,371 households (±455). 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	34.0 ±1.5	37.9 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 31,814
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Under 18	6,947 ±597	21.8% ±1.9 pp	22.0%	22.0%
18–34	9,434 ±762	29.7% ±2.4 pp	23.9%	22.8%
35–64	11,374 ±753	35.8% ±2.4 pp	38.5%	38.0%
65 and older	4,059 ±433	12.8% ±1.4 pp	15.7%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 31,814
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Male	15,948 ±460	50.1% ±1.4 pp	49.9%	49.5%
Female	15,866 ±462	49.9% ±1.5 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: 31,814
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
White alone	12,293 ±1,115	38.6% ±3.5 pp	39.7%	61.0%
Black or African American alone	1,515 ±373	4.8% ±1.2 pp	5.4%	12.2%
American Indian and Alaska Native alone	150 ±118 · low precision	0.5% ±0.4 pp · low precision	1.3%	0.9%
Asian alone	3,151 ±580	9.9% ±1.8 pp	15.5%	6.0%
Native Hawaiian and Other Pacific Islander alone	520 ±220	1.6% ±0.7 pp	0.4%	0.2%
Some other race alone	7,292 ±963	22.9% ±3.0 pp	18.5%	7.1%
Two or more races	6,893 ±1,006	21.7% ±3.2 pp	19.2%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 31,814
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Not Hispanic or Latino	16,471 ±834	51.8% ±2.6 pp	59.8%	80.7%
Hispanic or Latino	15,343 ±833	48.2% ±2.6 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: 10,371
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Married-couple family	4,827 ±447	46.5% ±3.8 pp	48.4%	46.9%
Other family: male householder, no spouse present	716 ±182	6.9% ±1.7 pp	6.3%	5.1%
Other family: female householder, no spouse present	1,424 ±215	13.7% ±2.0 pp	13.1%	12.2%
Nonfamily: householder living alone	2,268 ±343	21.9% ±3.2 pp	24.3%	28.7%
Nonfamily: householder not living alone	1,136 ±282	11.0% ±2.7 pp	7.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 10,371
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Households with people under 18	3,587 ±263	34.6% ±2.0 pp	32.4%	29.5%
Households without people under 18	6,784 ±527	65.4% ±4.2 pp	67.6%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 10,371
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
One-person nonfamily households	2,268 ±343	21.9% ±3.2 pp	24.3%	28.7%
Two-person households	2,941 ±393	28.4% ±3.6 pp	30.5%	33.8%
Three-person households	1,976 ±339	19.1% ±3.2 pp	16.7%	15.3%
Four-person households	1,723 ±237	16.6% ±2.2 pp	14.9%	12.6%
Five-person households	667 ±185	6.4% ±1.8 pp	7.7%	5.9%
Six-person households	451 ±149	4.3% ±1.4 pp	3.3%	2.2%
Seven or more people	345 ±125	3.3% ±1.2 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: 31,814
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Native	23,476 ±747	73.8% ±2.3 pp	73.0%	85.9%
Foreign born	8,338 ±747	26.2% ±2.3 pp	27.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 30,220
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
English only	16,694 ±883	55.2% ±2.9 pp	55.6%	77.7%
Spanish	10,610 ±848	35.1% ±2.8 pp	28.3%	13.6%
French, Haitian, or Cajun	176 ±120 · low precision	0.6% ±0.4 pp · low precision	0.4%	0.7%
German or other West Germanic	308 ±204 · low precision	1.0% ±0.7 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	62 ±53 · low precision	0.2% ±0.2 pp · low precision	0.7%	0.7%
Other Indo-European	535 ±237	1.8% ±0.8 pp	3.5%	2.0%
Korean	131 ±108 · low precision	0.4% ±0.4 pp · low precision	1.0%	0.3%
Chinese, including Mandarin and Cantonese	153 ±83 · low precision	0.5% ±0.3 pp · low precision	3.5%	1.1%
Vietnamese	127 ±71 · low precision	0.4% ±0.2 pp · low precision	1.5%	0.5%
Tagalog, including Filipino	911 ±286	3.0% ±0.9 pp	2.1%	0.6%
Other Asian and Pacific Island	406 ±150	1.3% ±0.5 pp	2.0%	1.1%
Arabic	80 ±71 · low precision	0.3% ±0.2 pp · low precision	0.6%	0.5%
Other and unspecified	27 ±37 · low precision	0.1% ±0.1 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: 20,682
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Less than high school graduate	3,756 ±594	18.2% ±2.8 pp	15.3%	10.4%
High school graduate or equivalency	4,559 ±476	22.0% ±2.2 pp	20.5%	26.0%
Some college, no degree	4,119 ±555	19.9% ±2.6 pp	19.3%	19.1%
Associate’s degree	2,133 ±405	10.3% ±1.9 pp	7.9%	8.8%
Bachelor’s degree	3,857 ±453	18.6% ±2.1 pp	22.7%	21.6%
Graduate or professional degree	2,258 ±313	10.9% ±1.5 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: 31,545
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Same house	26,019 ±918	82.5% ±2.9 pp	89.2%	87.7%
Moved within same county	1,642 ±406	5.2% ±1.3 pp	6.4%	6.3%
Moved from a different county in the same state	1,997 ±605	6.3% ±1.9 pp	2.6%	3.1%
Moved from a different state	1,367 ±586	4.3% ±1.9 pp	1.1%	2.3%
Moved from abroad	520 ±232	1.6% ±0.7 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

12.6% of Seaside residents (±1.8 percentage points) had no health insurance coverage when surveyed, compared with 6.6% in California and 8.4% nationally. 95.4% 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	Seaside	California	U.S.	Compared with California
People without health insurance Civilian noninstitutionalized population	12.6% ±1.8 pp	6.6%	8.4%	Higher
Households with a broadband subscription Households	95.4% ±1.5 pp	93.5%	91.0%	Higher
Veterans Civilian population age 18 and older	5.7% ±1.4 pp	4.3%	6.2%	Not statistically different

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 Seaside . 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 Seaside housing and cost context or return to the city profile.