ZIP Code 91789

ZIP code 91789 identifies a postal delivery area inside Walnut, California. The ZIP lies within Los Angeles County. Clocks here follow the America/Los_Angeles time zone (UTC-7).

About 43,973 people live in this ZIP code, and the median household income is roughly $93,231 a year. Figures come from the U.S. Census Bureau American Community Survey and are refreshed as new five-year estimates are released.

What you can do with ZIP code 91789

• Write a mailing address: Walnut, CA 91789. The ZIP goes last, after the state abbreviation.
• Check whether a shipping or delivery quote applies to this area — most US carriers price by ZIP code rather than by city.
• Look up the local time zone before scheduling a call — the ZIP tells you which zone applies to that address.
• Compare the ZIP with neighbouring codes to see how population and income shift block by block.