ZIP Code 91001: Altadena, CA
County: Los Angeles County
Coordinates: 34.19120, -118.13920
ZIP Type: Standard
Time Zone: Pacific Time (PT)
Get a reliable snapshot of the Altadena, CA postal area 91001. This page summarizes county, coordinates, and local facts to help with services and location research.
| Primary City | Altadena |
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| ZIP Code | 91001 |
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| County | Los Angeles County |
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| State | CA |
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| Latitude / Longitude | 34.19120, -118.13920 |
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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 91001 (not an exact boundary).
Geographic & Administrative Context
Coordinates for 91001 are listed as 34.19120 / -118.13920, useful for GPS and service checks in and around Altadena, CA.
Local Coverage Notes
ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 91001 for mail delivery and general location reference in
Los Angeles County,
CA.
Coverage may include nearby neighborhoods and adjacent unincorporated areas commonly associated with Altadena.
Related ZIP Codes (Nearby)
Explore other postal codes near Altadena within CA.
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Frequently Asked Questions
What is the primary city for ZIP code 91001?
The primary city for this ZIP code is Altadena, located in CA.
In which county is 91001 located?
ZIP code 91001 is situated within Los Angeles County, CA.
What are the coordinates for 91001?
The approximate center point is 34.19120 (Latitude) and -118.13920 (Longitude).
Is ZIP code 91001 active?
This page lists ZIP 91001 as Listed based on the latest refresh date shown above.
Does ZIP 91001 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