Castaic is a community in Los Angeles County, California, home to about 17,999 people across 7.3 square miles. Its ZIP code is 91384.
Homes sold for a median of $406 per square foot in the three months ending August 2026, a seller’s market.
Mostly Castaic; also Val Verde and Hasley Canyon
Each card is that ZIP code’s whole market, including any part outside Castaic. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Castaic’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Hollywood Burbank/Bob Hope Airport (BUR)25 miles away |
|---|---|
| Nearest city of 250,000+ | Los Angeles, CA34 miles away |
Straight-line distances from the center of Castaic; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Castaic had 18,937 residents in the 2020 census, up 0% since 2010.
It’s the 374th largest of 1,563 towns in California by population.
Los Angeles County grew from 170,298 residents in 1900 to 10,014,009 in 2020.
Los Angeles County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 96°F in summer, and winter lows average 44°F. About 16.6 inches of rain and melted snow fall in a typical year, with about 0 inches of snow.
Source: NOAA 1991–2020 climate normals, Newhall 5nw, CA weather station (6 miles away).
3,987,736 jobs at 304,988 businesses in Los Angeles County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
56 doctors and other health care providers list an office in Castaic.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Specialist doctors | 1 |
| Dentists | 8 |
| Nurse practitioners and physician assistants | 17 |
| Mental health providers | 22 |
| Physical and occupational therapists | 4 |
| Optometrists | 1 |
| Chiropractors | 2 |
| Pharmacies | 3 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (2 nearby)
Grocery stores (2 nearby)
Pharmacies (2 nearby)
Libraries (1 nearby)
Theaters and performance venues
Counts are within about 2 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Castaic Union, Santa Clarita Valley International District, William S. Hart Union High. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Castaic ElementaryCastaic | K–6 | 417 | Public | 0.8 mi |
| Live Oak ElementaryCastaic | K–6 | 490 | Public | 2.2 mi |
| Northlake Hills ElementaryCastaic | K–7 | 556 | Public | 2.0 mi |
| Santa Clarita Valley InternationalCastaic | K–12 | 548 | Charter | 2.2 mi |
| Castaic MiddleCastaic | 7–8 | 451 | Public | 1.2 mi |
| Castaic HighCastaic | 9–12 | 1,159 | Public | 1.8 mi |
| Non-RIS Preschool CMSCastaic | — | — | Public | 1.2 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Val Verde and Hasley Canyon.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.