Castaic, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Castaic, California is 18,479 as of the 2023 American Community Survey, making it the 370th-largest city in California. The median household income is $132,153, the median home value is $710,400, and the median age is 37.2.
18,479
Population
2545
People / sq mi
$132,153
Median Income
$710,400
Median Home Value
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Castaic covers 7.3 sq mi of land at 2545 people per square mile.
About Castaic, CA
Housing cost is the defining feature of Castaic: the median home is valued at $710,400. Castaic is a city in California with a population of 18,479.
The typical household earns $132,153 a year, above the US median of $78,538. Poverty is relatively low for US cities at 3.8%, below the national 12.4%. Home prices are steep, with the typical property valued at $710,400, with typical rent around $1,751.
Roughly 41.4% of adults have a bachelor’s, above the national 35.0%. Remote work is below the national 14.0% at 12.5%, and the average commute runs about 31 minutes each way.
High housing values reframe the income picture in Castaic — even solid earnings stretch less against home prices and rents at this level.
Race & Ethnicity
| White | 54.7% |
| Black or African American | 1.5% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 3.9% |
| Two or More Races | 0.0% |
Economy & Income
$132,153
Median Household Income
$50,338
Per Capita Income
3.8%
Poverty Rate
3.5%
Unemployment Rate
Housing
$710,400
Median Home Value
$1,751
Median Rent
84.4%
Owner-Occupied
Education
93.1%
High School+
41.4%
Bachelor's+
Commute
0.4%
Drive Alone
75.7%
Public Transit
12.5%
Work From Home
31.1 min
Avg Commute
Community Profile
12.1%
Foreign Born
68.0%
Non-English at Home
3.8%
Veterans
11.5%
With Disability
95.4%
Health Insurance
99.4%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 22.5% |
| Manufacturing | 9.8% |
| Information | 9.8% |
| Public Administration | 8.5% |
| Education, Health Care & Social Services | 8.2% |
| Finance, Insurance & Real Estate | 7.5% |
| Retail Trade | 6.3% |
| Transportation & Warehousing | 6.0% |
| Arts, Entertainment & Food Services | 4.9% |
| Construction | 4.1% |
| Agriculture & Mining | 0.7% |
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Frequently Asked Questions
Castaic, California has a population of 18,479 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 370th-largest city in California.
The median household income in Castaic, California is $132,153, with 3.8% of residents living below the federal poverty level.
The median home value in Castaic, California is $710,400, with median monthly rent at $1,751 and a homeownership rate of 84.4%.
The median age in Castaic, California is 37.2 years. The population is 50.2% male and 49.8% female.
Castaic Cdp, CA Climate
Castaic Cdp, CA has an average annual temperature of 17.5°C (64°F) and receives about 389 mm of precipitation per year. The warmest month is August and the coldest is January. Figures are 1970–2000 climate normals.
17.5°C
Avg Temp
389
Precip (mm/yr)
Aug
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 11° / 52° | 81 mm |
| February | 12° / 54° | 81 mm |
| March | 13° / 56° | 60 mm |
| April | 15° / 60° | 28 mm |
| May | 18° / 65° | 6 mm |
| June | 22° / 71° | 1 mm |
| July | 25° / 77° | 0 mm |
| August | 25° / 78° | 2 mm |
| September | 23° / 74° | 6 mm |
| October | 20° / 67° | 9 mm |
| November | 15° / 58° | 59 mm |
| December | 11° / 52° | 56 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Castaic Cdp, CA
The most comfortable months to visit Castaic Cdp, CA are typically June, October and September, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 34°C high). The coldest is January (near 4°C low). January is usually the wettest month.
Where to stay near Castaic
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.