Demographics · CA
Simi Valley, CA demographics: 125,634 residents, with a median age of 41.9 years, from the U.S. Census Bureau's American Community Survey 2020–2024 (5-year estimates).
125,634people live in Simi Valley, at a median age of 41.9 years (American Community Survey 2020–2024, a 5-year average)
Median age 41.9 years — older than the U.S. median of 38.9.
ACS 2020–2024 5-year · ACS 5-Year Estimates 2020-2024 (released 2026-01-29)
In Simi Valley, the largest race group is White (58.2%); 29.0% of residents are Hispanic or Latino (of any race); 18.5% were born outside the United States.
ACS 2020–2024 · B01001 / B01002
The median age in Simi Valley is 41.9 years (±0.7), older than the U.S. median of 38.9 years. The population is 49.5% male and 50.5% female. The largest age band is 5 to 17 at 15.0%.
| Age band | People | Share | ± margin |
|---|---|---|---|
| Under 5 | 5,654 | 4.5% | ±588 |
| 5 to 17 | 18,825 | 15.0% | ±1,066 |
| 18 to 24 | 11,165 | 8.9% | ±860 |
| 25 to 34 | 16,089 | 12.8% | ±937 |
| 35 to 44 | 15,889 | 12.6% | ±945 |
| 45 to 54 | 18,086 | 14.4% | ±969 |
| 55 to 64 | 18,337 | 14.6% | ±994 |
| 65 to 74 | 12,306 | 9.8% | ±878 |
| 75 and over | 9,283 | 7.4% | ±740 |
Median age by sex: 41.0 (male) · 43.0 (female).
Shares may not sum to 100% due to rounding. Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B01001 sex by age, B01002 median age) · place-grain · margins of error at the 90% confidence level · methodology →
ACS 2020–2024 · B02001 / B03003
The largest race group in Simi Valley is White at 58.2% of the population. Separately, 29.0% of residents are Hispanic or Latino of any race.Race and Hispanic origin are two different questions on the census form, so their shares are reported separately and are not additive.
| Race (alone, or two or more) | People | Share | ± margin |
|---|---|---|---|
| White alone | 73,113 | 58.2% | ±1,888 |
| Black or African American alone | 1,688 | 1.3% | ±466 |
| American Indian & Alaska Native alone | 1,174 | 0.9% | ±510 |
| Asian alone | 13,306 | 10.6% | ±1,016 |
| Native Hawaiian & Pacific Islander alone | 235 | 0.2% | ±116 |
| Some other race alone | 13,007 | 10.4% | ±1,337 |
| Two or more races | 23,111 | 18.4% | ±1,879 |
| Hispanic or Latino (of any race) | 36,438 | 29.0% | ±1,565 |
Race shares may not sum to 100% due to rounding; race and Hispanic origin are separate questions and are not additive. Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B02001 race, B03003 Hispanic or Latino origin) · place-grain · margins of error at the 90% confidence level · methodology →
ACS 2020–2024 · B11001 / B25010
Simi Valley has 44,457 households. 70.7% are family households and 22.5% are people living alone. The average household holds 2.80 people.
Total households
44,457
ACS 2020–2024 5-yr · B11001
Avg household size
2.80
ACS 2020–2024 5-yr · B25010 · ±0.05
Family households
70.7%
Share of all households · B11001
Living alone
22.5%
Share of all households · B11001
| Household type | Households | ± margin |
|---|---|---|
| Total households | 44,457 | ±798 |
| Family households | 31,436 | ±692 |
| Nonfamily households | 13,021 | ±918 |
| Householder living alone | 10,015 | ±968 |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B11001 household type, B25010 average household size) · place-grain · methodology →
ACS 2020–2024 · B05002 / C16001
18.5% of Simi Valley residents were born outside the United States. 73.3% of residents age 5 and over speak only English at home. The most-spoken non-English language at home is Spanish (16.2%).
| Measure | Value | Source / grain |
|---|---|---|
| Foreign-born share | 18.5% | 23,183 people · B05002 |
| Speak only English at home (age 5+) | 73.3% | C16001 |
| Top non-English language at home | 16.2% | Spanish · 19,464 speakers · C16001 |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B05002 place of birth, C16001 language spoken at home) · place-grain · methodology →
ACS 2020–2024 · B15003
39.1% of adults age 25 and over in Simi Valley hold a bachelor's degree or higher (the U.S. share is about 35%).
| Measure | Value | Source / grain |
|---|---|---|
| Bachelor's degree or higher (age 25+) | 39.1% | B15003 lines 22–25 over line 1 · place-grain |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B15003 educational attainment, population 25+) · place-grain · methodology →
Sources · provenance
The GEOID for Simi Valley is 0672016. Every figure on this page is a place-grain American Community Survey 5-Year 2020–2024 estimate (ACS 5-Year Estimates 2020-2024 (released 2026-01-29)) shown with its margin of error. Full per-dataset detail: /sources/.