ZIP code 91789: Walnut, CA
91789 is a ZIP code in Walnut, California, mainly in Los Angeles County, part of the Los Angeles-Long Beach-Anaheim, CA metro area. About 40,298 people live here.
- Population
- 40,298
- Median household income
- $125,720
- Typical home value
- $1,127,900+1.4% in 12 months
- Median rent
- $2,865gross, per month
- Median age
- 46.3
- Homeowners
- 82.1%of occupied homes
Shaded: ZIP code 91789's area. Click anywhere on the map to see which ZIP code it's in.
ZIP codes within 10 milesWithin 25 miles
ZIP code 91789 details
| City | Walnut |
|---|---|
| State | California |
| County | Los Angeles County |
| Metro area | Los Angeles-Long Beach-Anaheim, CA |
| Time zone | Pacific Time (UTC−8), observes daylight saving time |
| Type | Standard (delivery area) |
| Land area | 15.9 sq mi, plus 0.1 sq mi of water |
| Population density | 2,539 people per sq mi |
| Bachelor's degree or higher | 54.4% of adults 25+ |
| Average commute | 33.5 minutes |
| Center coordinates | 34.01819, -117.85482 |
Median rent in 91789 by bedrooms
| Size | Median gross rent |
|---|---|
| 1 bedroom | $2,147/mo |
| 2 bedrooms | $2,220/mo |
| 3 bedrooms | $2,818/mo |
| 4 bedrooms | $3,501/mo |
| 5+ bedrooms | $3,500/mo |
Gross rent includes utilities paid by the tenant. ACS 2020–2024; sizes with too few rentals to estimate are left out.
ZIP codes near 91789
| ZIP code | City | Distance | Population |
|---|---|---|---|
| 91788 | Walnut, CA | 0.6 mi | — |
| 91792 | West Covina, CA | 2.7 mi | 30,629 |
| 91765 | Diamond Bar, CA | 3.4 mi | 44,502 |
| 91791 | West Covina, CA | 3.7 mi | 33,028 |
| 91748 | Rowland Heights, CA | 3.9 mi | 42,463 |
| 91724 | Covina, CA | 4.2 mi | 28,352 |
| 91744 | La Puente, CA | 4.8 mi | 76,942 |
| 91768 | Pomona, CA | 4.9 mi | 34,200 |
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
Buying a home in 91789?
A typical home in ZIP code 91789 is worth about $1,127,900 (Zillow Home Value Index). The median household here earns $125,720 a year. See what buying here would cost per month, with California average taxes and insurance filled in.
Monthly payment for a $1,127,900 homeWhat can a $125,720 income afford?Rental property numbers
About ZIP code 91789
What city is ZIP code 91789?
ZIP code 91789 is in Walnut, CA, in Los Angeles County.
What county is ZIP code 91789 in?
91789 is mainly in Los Angeles County, California.
What is the population of ZIP code 91789?
About 40,298 people live in ZIP code 91789, according to the American Community Survey 2020–2024 5-year estimates.
What time zone is ZIP code 91789 in?
91789 is in Pacific Time (UTC−8). It observes daylight saving time.
What other ZIP codes does Walnut have?
Walnut, CA also uses 91788.