Castaic, CA ZIP codes
Castaic, California has 2 ZIP codes, including 1 PO Box ZIP. They are in Los Angeles County.
- Population in these ZIPs
- 26,478
- Avg. median income
- $131,700population-weighted
- Typical home value
- $795,200population-weighted
- Metro area
- Los Angeles-Long Beach-Anaheim, CA
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Castaic, CA ZIP codes list
| ZIP code | County | Population | Median income | Typical home value |
|---|---|---|---|---|
| 91310 PO Box | Los Angeles County | — | — | — |
| 91384 | Los Angeles County | 26,478 | $131,689 | $795,200 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Castaic
- Valencia 6 mi
- Santa Clarita 8 mi
- Stevenson Ranch 9 mi
- Newhall 12 mi
- Canyon Country 14 mi
- Lake Hughes 14 mi
- Fillmore 16 mi
- Chatsworth 16 mi
- Porter Ranch 16 mi
- Simi Valley 17 mi
- Granada Hills 17 mi
- Sylmar 18 mi
Frequently asked questions
What county is Castaic, California in?
Castaic ZIP codes are in Los Angeles County.
Which Castaic ZIP codes are PO Boxes?
91310 is a PO Box or single-organization ZIP code; it has no residential delivery area.