Simi Valley, California demographics

Simi Valley, CA demographics: median age 41.9; 39.1% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Simi Valley city, California · Incorporated city · GEOID 0672016. The survey estimates a population of 125,634 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Simi Valley is 41.9 years, with a 90% margin of error of 0.7 years. There are 44,457 households (±798). 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	41.9 ±0.7	37.9 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 125,634
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Under 18	24,479 ±1,217	19.5% ±1.0 pp	22.0%	22.0%
18–34	27,254 ±1,272	21.7% ±1.0 pp	23.9%	22.8%
35–64	52,312 ±1,679	41.6% ±1.3 pp	38.5%	38.0%
65 and older	21,589 ±1,148	17.2% ±0.9 pp	15.7%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 125,634
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Male	62,163 ±1,050	49.5% ±0.8 pp	49.9%	49.5%
Female	63,471 ±1,062	50.5% ±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: 125,634
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
White alone	73,113 ±1,888	58.2% ±1.5 pp	39.7%	61.0%
Black or African American alone	1,688 ±466	1.3% ±0.4 pp	5.4%	12.2%
American Indian and Alaska Native alone	1,174 ±510	0.9% ±0.4 pp	1.3%	0.9%
Asian alone	13,306 ±1,016	10.6% ±0.8 pp	15.5%	6.0%
Native Hawaiian and Other Pacific Islander alone	235 ±116	0.2% ±0.1 pp	0.4%	0.2%
Some other race alone	13,007 ±1,337	10.4% ±1.1 pp	18.5%	7.1%
Two or more races	23,111 ±1,879	18.4% ±1.5 pp	19.2%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 125,634
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Not Hispanic or Latino	89,196 ±1,578	71.0% ±1.3 pp	59.8%	80.7%
Hispanic or Latino	36,438 ±1,565	29.0% ±1.2 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: 44,457
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Married-couple family	24,430 ±718	55.0% ±1.3 pp	48.4%	46.9%
Other family: male householder, no spouse present	2,772 ±402	6.2% ±0.9 pp	6.3%	5.1%
Other family: female householder, no spouse present	4,234 ±427	9.5% ±0.9 pp	13.1%	12.2%
Nonfamily: householder living alone	10,015 ±968	22.5% ±2.1 pp	24.3%	28.7%
Nonfamily: householder not living alone	3,006 ±391	6.8% ±0.9 pp	7.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 44,457
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Households with people under 18	13,580 ±549	30.5% ±1.1 pp	32.4%	29.5%
Households without people under 18	30,877 ±1,072	69.5% ±2.1 pp	67.6%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 44,457
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
One-person nonfamily households	10,015 ±968	22.5% ±2.1 pp	24.3%	28.7%
Two-person households	14,031 ±852	31.6% ±1.8 pp	30.5%	33.8%
Three-person households	8,313 ±679	18.7% ±1.5 pp	16.7%	15.3%
Four-person households	7,292 ±583	16.4% ±1.3 pp	14.9%	12.6%
Five-person households	2,852 ±343	6.4% ±0.8 pp	7.7%	5.9%
Six-person households	1,095 ±234	2.5% ±0.5 pp	3.3%	2.2%
Seven or more people	859 ±181	1.9% ±0.4 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: 125,634
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Native	102,451 ±1,410	81.5% ±1.1 pp	73.0%	85.9%
Foreign born	23,183 ±1,408	18.5% ±1.1 pp	27.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 119,980
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
English only	87,938 ±1,755	73.3% ±1.4 pp	55.6%	77.7%
Spanish	19,464 ±1,414	16.2% ±1.2 pp	28.3%	13.6%
French, Haitian, or Cajun	332 ±199 · low precision	0.3% ±0.2 pp · low precision	0.4%	0.7%
German or other West Germanic	359 ±178	0.3% ±0.1 pp	0.3%	0.5%
Russian, Polish, or other Slavic	402 ±160	0.3% ±0.1 pp	0.7%	0.7%
Other Indo-European	4,321 ±655	3.6% ±0.5 pp	3.5%	2.0%
Korean	416 ±193	0.3% ±0.2 pp	1.0%	0.3%
Chinese, including Mandarin and Cantonese	1,522 ±406	1.3% ±0.3 pp	3.5%	1.1%
Vietnamese	876 ±272	0.7% ±0.2 pp	1.5%	0.5%
Tagalog, including Filipino	1,502 ±315	1.3% ±0.3 pp	2.1%	0.6%
Other Asian and Pacific Island	1,885 ±401	1.6% ±0.3 pp	2.0%	1.1%
Arabic	447 ±287 · low precision	0.4% ±0.2 pp · low precision	0.6%	0.5%
Other and unspecified	516 ±268 · low precision	0.4% ±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: 89,990
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Less than high school graduate	8,284 ±744	9.2% ±0.8 pp	15.3%	10.4%
High school graduate or equivalency	16,773 ±1,130	18.6% ±1.2 pp	20.5%	26.0%
Some college, no degree	19,895 ±1,135	22.1% ±1.2 pp	19.3%	19.1%
Associate’s degree	9,860 ±928	11.0% ±1.0 pp	7.9%	8.8%
Bachelor’s degree	23,108 ±1,251	25.7% ±1.4 pp	22.7%	21.6%
Graduate or professional degree	12,070 ±878	13.4% ±1.0 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: 124,385
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Same house	114,109 ±1,395	91.7% ±1.1 pp	89.2%	87.7%
Moved within same county	5,793 ±1,024	4.7% ±0.8 pp	6.4%	6.3%
Moved from a different county in the same state	3,487 ±661	2.8% ±0.5 pp	2.6%	3.1%
Moved from a different state	747 ±318	0.6% ±0.3 pp	1.1%	2.3%
Moved from abroad	249 ±137 · low precision	0.2% ±0.1 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

4.6% of Simi Valley residents (±0.7 percentage points) had no health insurance coverage when surveyed, compared with 6.6% in California and 8.4% nationally. 94.9% 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	Simi Valley	California	U.S.	Compared with California
People without health insurance Civilian noninstitutionalized population	4.6% ±0.7 pp	6.6%	8.4%	Lower
Households with a broadband subscription Households	94.9% ±0.7 pp	93.5%	91.0%	Higher
Veterans Civilian population age 18 and older	4.2% ±0.5 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 Simi Valley . 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 Simi Valley housing and cost context or return to the city profile.