ZIP Code 91789: Walnut, CA
County: Los Angeles County
Coordinates: 34.01830, -117.85460
ZIP Type: Standard
Time Zone: Pacific Time (PT)
Explore detailed information for ZIP code 91789 in Walnut, CA. We include verified county details for Los Angeles County plus key geographic references used for mapping and logistics.
| Primary City | Walnut |
|---|
| ZIP Code | 91789 |
|---|
| County | Los Angeles County |
|---|
| State | CA |
|---|
| Latitude / Longitude | 34.01830, -117.85460 |
|---|
| ZIP Type | Standard |
|---|
| Time Zone | Pacific Time (PT) |
|---|
| Data Updated | 2026-01-08 |
|---|
Advertisement
Maps & Useful Links
Open in Maps:
Google Maps ·
OpenStreetMap
These links show the approximate center point for ZIP 91789 (not an exact boundary).
Geographic & Administrative Context
Coordinates for 91789 are listed as 34.01830 / -117.85460, useful for GPS and service checks in and around Walnut, CA.
Local Coverage Notes
ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 91789 for mail delivery and general location reference in
Los Angeles County,
CA.
Coverage may include nearby neighborhoods and adjacent unincorporated areas commonly associated with Walnut.
Related ZIP Codes (Nearby)
Explore other postal codes near Walnut within CA.
Advertisement
Frequently Asked Questions
What is the primary city for ZIP code 91789?
The primary city for this ZIP code is Walnut, located in CA.
In which county is 91789 located?
ZIP code 91789 is situated within Los Angeles County, CA.
What are the coordinates for 91789?
The approximate center point is 34.01830 (Latitude) and -117.85460 (Longitude).
Is ZIP code 91789 active?
This page lists ZIP 91789 as Listed based on the latest refresh date shown above.
Does ZIP 91789 cover multiple areas?
Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.
Advertisement
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