ZIP Code 91788: Walnut, CA
County: Los Angeles County
Coordinates: 34.02030, -117.86530
ZIP Type: Standard
Time Zone: Pacific Time (PT)
Get a reliable snapshot of the Walnut, CA postal area 91788. This page summarizes county, coordinates, and local facts to help with services and location research.
| Primary City | Walnut |
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| ZIP Code | 91788 |
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| County | Los Angeles County |
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| State | CA |
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| Latitude / Longitude | 34.02030, -117.86530 |
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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 91788 (not an exact boundary).
Geographic & Administrative Context
The geographic center of ZIP code 91788 is approximately 34.02030 (latitude) and -117.86530 (longitude). This location sits within Los Angeles County, contributing to regional planning across CA.
Local Coverage Notes
ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 91788 for mail delivery and general location reference in
Los Angeles County,
CA.
Some addresses near Walnut may share this ZIP due to delivery routing and local service areas.
Related ZIP Codes (Nearby)
Explore other postal codes near Walnut within CA.
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Frequently Asked Questions
What is the primary city for ZIP code 91788?
The primary city for this ZIP code is Walnut, located in CA.
In which county is 91788 located?
ZIP code 91788 is situated within Los Angeles County, CA.
What are the coordinates for 91788?
The approximate center point is 34.02030 (Latitude) and -117.86530 (Longitude).
Is ZIP code 91788 active?
This page lists ZIP 91788 as Listed based on the latest refresh date shown above.
Does ZIP 91788 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