About ZIP code 91788
The ZIP code 91788 routes mail to Walnut in the California region of United States. Use it as the postal segment of any address in this area, and confirm unusual addresses with the local postal operator.
United States ยท ZIP code
91788 - Walnut
ZIP code 91788 is Walnut in California, United States.
| ZIP code | 91788 |
| Place | Walnut |
| Region | California |
| District | Los Angeles |
| Country | United States (US) |
| Coordinates | 34.0203, -117.8653 (map) |