ZIP Code 91310: Castaic, CA
County: Los Angeles County
Coordinates: 34.48890, -118.62290
ZIP Type: Standard
Time Zone: Pacific Time (PT)
Explore detailed information for ZIP code 91310 in Castaic, CA. We include verified county details for Los Angeles County plus key geographic references used for mapping and logistics.
| Primary City | Castaic |
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| ZIP Code | 91310 |
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| County | Los Angeles County |
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| State | CA |
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| Latitude / Longitude | 34.48890, -118.62290 |
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| ZIP Type | Standard |
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| Time Zone | Pacific Time (PT) |
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| Data Updated | 2026-01-08 |
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Maps & Useful Links
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These links show the approximate center point for ZIP 91310 (not an exact boundary).
Geographic & Administrative Context
Coordinates for 91310 are listed as 34.48890 / -118.62290, useful for GPS and service checks in and around Castaic, CA.
Local Coverage Notes
ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 91310 for mail delivery and general location reference in
Los Angeles County,
CA.
Some addresses near Castaic may share this ZIP due to delivery routing and local service areas.
Related ZIP Codes (Nearby)
Explore other postal codes near Castaic within CA.
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Frequently Asked Questions
What is the primary city for ZIP code 91310?
The primary city for this ZIP code is Castaic, located in CA.
In which county is 91310 located?
ZIP code 91310 is situated within Los Angeles County, CA.
What are the coordinates for 91310?
The approximate center point is 34.48890 (Latitude) and -118.62290 (Longitude).
Is ZIP code 91310 active?
This page lists ZIP 91310 as Listed based on the latest refresh date shown above.
Does ZIP 91310 cover multiple areas?
Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.
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Methodology & Data Notes
How we build this page: We generate this page from a structured ZIP dataset and refresh key fields (city, county, and coordinates) during scheduled updates. Coordinates represent an approximate center point, not an official boundary map.
Sources: Public ZIP reference datasets and geographic coordinate references. If you use specific sources (e.g., USPS, Census), list them on your About/Methodology page.
Page updated: 2026-01-08