Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

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zipcodes.pro — CITY/CA/WALNUT

Walnut ZIP codes, California

Walnut, CA has 2 ZIP codes: 91789 and 91788. The largest is 91789.

USPS city name
2 ZIP codes
Overlapping the city
2 more
Population
27,611

Mail addressed to Walnut uses the ZIP codes above. 2 more ZIP codes cover part of the city but are addressed as somewhere else; they are listed separately below.

Walnut in numbers

About 27,611 people live in Walnut, in 8,665 households. The median household income is $129,449 a year, 31% above the California median of $99,122 (US: $80,734). The median owner-occupied home is valued at $1,014,000 (38% above the California median), and median gross rent is $3,202 a month. The median age is 46.8; 57.3% of adults 25 and over hold a bachelor's degree or higher (37.1% across California); the average commute takes 34 minutes.

Population27,611Walnut27,611
Households8,665Walnut8,665
Median age46.8Walnut46.8California37.9US 38.9
Median household income$129,449Walnut$129,449California$99,122US $80,734
Median home value$1,014,000Walnut$1,014,000California$734,700US $332,700
Median gross rent$3,202Walnut$3,202California$2,036US $1,413
Bachelor's degree or higher57.3%Walnut57.3%California37.1%US 35.7%
Mean commute33.5 minWalnut33.5 minCalifornia28.7 minUS 26.4 min
Population density3,072 / sq miWalnut3,072 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Walnut city. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Walnut

ZIP codes with the USPS city name Walnut
ZIP City Type Population Median income Median home
91789 Walnut , CA Standard 40,298 $125,720 $975,000
91788 Walnut , CA No street area — — —

Other ZIP codes overlapping Walnut

These ZIP codes cover part of Walnut but are addressed as somewhere else.

ZIP codes overlapping Walnut
ZIP City Type Population Median income Median home
91724 Covina , CA Standard 28,352 $103,163 $782,700
91792 West Covina , CA Standard 30,629 $94,817 $696,200

Map of Walnut ZIP codes

9178991788

The ZIP codes of Walnut, CA, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Walnut

The nearest larger towns are Diamond Bar (53,355 people, 3.3 mi), West Covina (107,037 people, 3.4 mi) and Covina (49,888 people, 4.0 mi).

Towns near Walnut
TownPopulationDistance
South San Jose Hills 16,911 3.3 mi
Diamond Bar 53,355 3.3 mi
West Covina 107,037 3.4 mi
Covina 49,888 4.0 mi
Valinda 20,962 4.3 mi
Charter Oak 9,442 4.5 mi
Rowland Heights 45,911 5.0 mi
San Dimas 33,789 5.6 mi
Pomona 147,943 5.6 mi
La Puente 37,142 5.6 mi
Citrus 10,904 5.7 mi
Vincent 15,340 5.7 mi
West Puente Valley 22,495 6.4 mi
Hacienda Heights 54,291 7.3 mi

More nearby: every ZIP code in Los Angeles County · California ZIP codes

Cite this page

zipcodes.pro. “Walnut, CA ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/ca/walnut

Underlying data is public domain or openly licensed — sources, vintages and licences.