Walnut, CA ZIP codes
Walnut, California has 2 ZIP codes, including 1 PO Box ZIP. They are in Los Angeles County.
- Population in these ZIPs
- 40,298
- Avg. median income
- $125,700population-weighted
- Typical home value
- $1,127,900population-weighted
- Metro area
- Los Angeles-Long Beach-Anaheim, CA
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Walnut, CA ZIP codes list
| ZIP code | County | Population | Median income | Typical home value |
|---|---|---|---|---|
| 91788 PO Box | Los Angeles County | — | — | — |
| 91789 | Los Angeles County | 40,298 | $125,720 | $1,127,900 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Walnut
- Diamond Bar 4 mi
- Rowland Heights 4 mi
- West Covina 4 mi
- Covina 5 mi
- La Puente 6 mi
- Brea 6 mi
- Pomona 6 mi
- Hacienda Heights 7 mi
- San Dimas 7 mi
- La Habra 8 mi
- Baldwin Park 8 mi
- Glendora 8 mi
Frequently asked questions
What county is Walnut, California in?
Walnut ZIP codes are in Los Angeles County.
Which Walnut ZIP codes are PO Boxes?
91788 is a PO Box or single-organization ZIP code; it has no residential delivery area.