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

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/CA/DIABLO

Diablo ZIP code, California

The ZIP code for Diablo, CA is 94528, and its area code is 925.

USPS city name
1 ZIP code
Overlapping the city
1 more
Population
1,232
Area code
925

NANPA lists no telephone rate centre for Diablo itself, so these are the area codes of the nearest one, Danville (2.3 miles). A town on an area-code boundary can differ from its neighbour.

Mail addressed to Diablo uses the ZIP code above. 1 more ZIP code covers part of the city but is addressed as somewhere else; they are listed separately below.

Diablo in numbers

About 1,232 people live in Diablo, in 437 households. The median household income is $248,150 a year, 2.5 times the California median of $99,122 (US: $80,734). The median owner-occupied home is valued at $2,000,000+. The median age is 43.3; 72.3% of adults 25 and over hold a bachelor's degree or higher (37.1% across California); the average commute takes 33 minutes.

Population1,232Diablo1,232
Households437Diablo437
Median age43.3Diablo43.3California37.9US 38.9
Median household income$248,150Diablo$248,150California$99,122US $80,734
Median home value$2,000,000+Diablo$2,000,000+California$734,700US $332,700
Bachelor's degree or higher72.3%Diablo72.3%California37.1%US 35.7%
Mean commute32.8 minDiablo32.8 minCalifornia28.7 minUS 26.4 min
Population density903 / sq miDiablo903 / sq mi

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

ZIP codes addressed as Diablo

ZIP codes with the USPS city name Diablo
ZIP City Type Population Median income Median home
94528 Diablo , CA Standard 1,049 $207,500 $2,000,000+

Other ZIP codes overlapping Diablo

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

ZIP codes overlapping Diablo
ZIP City Type Population Median income Median home
94506 Danville , CA Standard 27,055 $250,000+ $1,956,800

Map of Diablo ZIP codes

94528

The ZIP codes of Diablo, 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 Diablo

The nearest larger towns are Danville (43,401 people, 2.1 mi), Blackhawk (10,137 people, 3.2 mi) and Alamo (14,488 people, 3.3 mi).

Towns near Diablo
TownPopulationDistance
Danville 43,401 2.1 mi
Blackhawk 10,137 3.2 mi
Alamo 14,488 3.3 mi
Camino Tassajara 5,831 5.2 mi
San Ramon 85,993 5.4 mi
San Miguel 3,967 5.4 mi
Walnut Creek 70,088 6.3 mi
Clayton 10,937 7.0 mi
Saranap 5,662 7.3 mi
Contra Costa Centre 6,893 7.9 mi
Moraga 16,769 9.1 mi
Dublin 70,803 9.2 mi
Concord 124,035 9.4 mi
Lafayette 25,285 9.5 mi

More nearby: every ZIP code in Contra Costa County · California ZIP codes

Cite this page

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

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