Walnut Creek, California demographics

Walnut Creek, CA demographics: median age 46.8; 70.4% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Walnut Creek city, California · Incorporated city · GEOID 0683346. The survey estimates a population of 70,088 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Walnut Creek is 46.8 years, with a 90% margin of error of 1.4 years. There are 33,072 households (±781). 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	46.8 ±1.4	37.9 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 70,088
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Under 18	10,847 ±802	15.5% ±1.1 pp	22.0%	22.0%
18–34	13,992 ±1,005	20.0% ±1.4 pp	23.9%	22.8%
35–64	24,578 ±1,126	35.1% ±1.6 pp	38.5%	38.0%
65 and older	20,671 ±1,100	29.5% ±1.6 pp	15.7%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 70,088
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Male	33,428 ±862	47.7% ±1.2 pp	49.9%	49.5%
Female	36,660 ±863	52.3% ±1.2 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: 70,088
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
White alone	44,828 ±1,491	64.0% ±2.1 pp	39.7%	61.0%
Black or African American alone	1,320 ±351	1.9% ±0.5 pp	5.4%	12.2%
American Indian and Alaska Native alone	343 ±239 · low precision	0.5% ±0.3 pp · low precision	1.3%	0.9%
Asian alone	12,101 ±1,225	17.3% ±1.7 pp	15.5%	6.0%
Native Hawaiian and Other Pacific Islander alone	88 ±78 · low precision	0.1% ±0.1 pp · low precision	0.4%	0.2%
Some other race alone	2,372 ±461	3.4% ±0.7 pp	18.5%	7.1%
Two or more races	9,036 ±1,172	12.9% ±1.7 pp	19.2%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 70,088
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Not Hispanic or Latino	61,396 ±933	87.6% ±1.3 pp	59.8%	80.7%
Hispanic or Latino	8,692 ±935	12.4% ±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: 33,072
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Married-couple family	15,023 ±616	45.4% ±1.5 pp	48.4%	46.9%
Other family: male householder, no spouse present	975 ±275	2.9% ±0.8 pp	6.3%	5.1%
Other family: female householder, no spouse present	2,022 ±329	6.1% ±1.0 pp	13.1%	12.2%
Nonfamily: householder living alone	12,541 ±978	37.9% ±2.8 pp	24.3%	28.7%
Nonfamily: householder not living alone	2,511 ±366	7.6% ±1.1 pp	7.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 33,072
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Households with people under 18	6,305 ±457	19.1% ±1.3 pp	32.4%	29.5%
Households without people under 18	26,767 ±1,050	80.9% ±2.5 pp	67.6%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 33,072
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
One-person nonfamily households	12,541 ±978	37.9% ±2.8 pp	24.3%	28.7%
Two-person households	12,213 ±793	36.9% ±2.2 pp	30.5%	33.8%
Three-person households	3,874 ±464	11.7% ±1.4 pp	16.7%	15.3%
Four-person households	3,205 ±330	9.7% ±1.0 pp	14.9%	12.6%
Five-person households	880 ±276	2.7% ±0.8 pp	7.7%	5.9%
Six-person households	260 ±116	0.8% ±0.3 pp	3.3%	2.2%
Seven or more people	99 ±81 · low precision	0.3% ±0.2 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: 70,088
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Native	53,017 ±1,100	75.6% ±1.6 pp	73.0%	85.9%
Foreign born	17,071 ±1,102	24.4% ±1.6 pp	27.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 67,072
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
English only	48,397 ±1,151	72.2% ±1.6 pp	55.6%	77.7%
Spanish	5,036 ±825	7.5% ±1.2 pp	28.3%	13.6%
French, Haitian, or Cajun	637 ±294	0.9% ±0.4 pp	0.4%	0.7%
German or other West Germanic	393 ±154	0.6% ±0.2 pp	0.3%	0.5%
Russian, Polish, or other Slavic	2,404 ±542	3.6% ±0.8 pp	0.7%	0.7%
Other Indo-European	3,350 ±535	5.0% ±0.8 pp	3.5%	2.0%
Korean	783 ±280	1.2% ±0.4 pp	1.0%	0.3%
Chinese, including Mandarin and Cantonese	3,073 ±499	4.6% ±0.7 pp	3.5%	1.1%
Vietnamese	296 ±227 · low precision	0.4% ±0.3 pp · low precision	1.5%	0.5%
Tagalog, including Filipino	635 ±197	0.9% ±0.3 pp	2.1%	0.6%
Other Asian and Pacific Island	1,318 ±467	2.0% ±0.7 pp	2.0%	1.1%
Arabic	310 ±166 · low precision	0.5% ±0.2 pp · low precision	0.6%	0.5%
Other and unspecified	440 ±220	0.7% ±0.3 pp	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: 55,230
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Less than high school graduate	1,537 ±363	2.8% ±0.7 pp	15.3%	10.4%
High school graduate or equivalency	4,889 ±607	8.9% ±1.1 pp	20.5%	26.0%
Some college, no degree	6,408 ±639	11.6% ±1.1 pp	19.3%	19.1%
Associate’s degree	3,498 ±435	6.3% ±0.8 pp	7.9%	8.8%
Bachelor’s degree	22,016 ±1,096	39.9% ±1.9 pp	22.7%	21.6%
Graduate or professional degree	16,882 ±1,022	30.6% ±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: 69,594
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Same house	58,848 ±1,111	84.6% ±1.6 pp	89.2%	87.7%
Moved within same county	4,273 ±719	6.1% ±1.0 pp	6.4%	6.3%
Moved from a different county in the same state	4,323 ±870	6.2% ±1.3 pp	2.6%	3.1%
Moved from a different state	1,580 ±613	2.3% ±0.9 pp	1.1%	2.3%
Moved from abroad	570 ±360 · low precision	0.8% ±0.5 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

2.3% of Walnut Creek residents (±0.6 percentage points) had no health insurance coverage when surveyed, compared with 6.6% in California and 8.4% nationally. 96.3% 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	Walnut Creek	California	U.S.	Compared with California
People without health insurance Civilian noninstitutionalized population	2.3% ±0.6 pp	6.6%	8.4%	Lower
Households with a broadband subscription Households	96.3% ±0.9 pp	93.5%	91.0%	Higher
Veterans Civilian population age 18 and older	5.6% ±0.8 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 Walnut Creek . 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 Walnut Creek housing and cost context or return to the city profile.