ZIP code 91789
Where is ZIP code 91789?
Walnut, California
Los Angeles County · Standard ZIP code
ZIP code 91789 belongs to Walnut, California in Los Angeles County. 91789 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Pacific Time zone and uses area codes 626, 840 and 909. About 40,298 people live in the 91789 area, where the median household income is $125,720. The closest ZIP codes are 91788 (Walnut, 0.6 mi west), 91792 (West Covina, 2.5 mi west) and 91765 (Diamond Bar, 2.7 mi east).
| ZIP code | 91789 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Walnut |
| Also accepted | City Industry, City Of Industry, Diamond Bar |
| State | California (CA) |
| County | Los Angeles County |
| Time zone | Pacific Time · now |
| Area codes | 626, 840, 909 |
| Coordinates | 34.0183, -117.8546 map |
| 3-digit prefix | 917 |
Population and income in 91789
| Population | 40,298 · higher than 78% of California ZIP codes |
|---|---|
| People per square mile | 2,540 · higher than 62% of California ZIP codes |
| Median age | 46.3 years · higher than 75% of California ZIP codes |
| Men / women | 49% / 51% |
| Median household income | $125,720 · higher than 76% of California ZIP codes |
| Income per person | $49,392 |
| Below the poverty line | 9.2% |
| Bachelor’s degree or higher | 54% of adults 25+ |
| Median home value | $975,000 · higher than 75% of California ZIP codes |
| Median rent | $2,865 a month |
| Housing units | 13,503 |
| Households | 12,681 (3.17 people on average) |
| Owners / renters | 82% / 18% |
| Land area | 15.87 sq mi (plus 0.05 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 91789. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 91789
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 91788 | Walnut, CA | 0.6 mi W | PO Box only |
| 91792 | West Covina, CA | 2.5 mi W | Standard |
| 91765 | Diamond Bar, CA | 2.7 mi E | Standard |
| 91748 | Rowland Heights, CA | 3.5 mi SW | Standard |
| 91791 | West Covina, CA | 4.1 mi NW | Standard |
| 91744 | La Puente, CA | 4.8 mi W | Standard |
| 91723 | Covina, CA | 5 mi N | Standard |
| 91724 | Covina, CA | 5.2 mi N | Standard |
| 91747 | La Puente, CA | 5.4 mi W | PO Box only |
| 91749 | La Puente, CA | 5.4 mi W | PO Box only |
| 91768 | Pomona, CA | 5.6 mi NE | Standard |
| 91790 | West Covina, CA | 5.8 mi NW | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 91789 or measure the distance to another ZIP code.
How to address mail to 91789
123 MAIN ST
WALNUT CA 91789
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts CITY INDUSTRY, CITY OF INDUSTRY and DIAMOND BAR as the city name for 91789. Adding the 4-digit ZIP+4 code (91789-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Walnut, CA
All Walnut ZIP codes with population and income →
Questions
- What city is ZIP code 91789?
- 91789 is a Walnut, California ZIP code. City Industry, City Of Industry and Diamond Bar are also accepted as the city name.
- What county is 91789 in?
- ZIP code 91789 is in Los Angeles County, California.
- What time zone is ZIP code 91789 in?
- 91789 is in the Pacific Time zone (America/Los_Angeles).
- What area code is 91789?
- Phone numbers in ZIP code 91789 use area codes 626, 840 and 909.
- What is the population of ZIP code 91789?
- About 40,298 people live in ZIP code 91789, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 91789?
- The median household income in 91789 is $125,720 a year, higher than 76% of California ZIP codes.
- What ZIP codes are near 91789?
- The nearest ZIP codes to 91789 are 91788 (Walnut, 0.6 miles), 91792 (West Covina, 2.5 miles), 91765 (Diamond Bar, 2.7 miles) and 91748 (Rowland Heights, 3.5 miles).