ZIP Code Tabulation Area · California

ZIP Code 94528: Diablo, CA

ZIP Code 94528 (Diablo, Contra Costa County, California) has an estimated 1,049 residents in 424 households. The median household income is $207,500, the median home value is $2,000,000+ and the median gross rent is —. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated

Some estimates have a large margin of error. 5 figures for this ZIP (population, household income, poverty rate, bachelor's or higher, commute) are marked with *. ACS figures come from a sample, and small areas have fewer responses, so treat these numbers as rough ranges.

Total population

1,049*

Margin of error ±531· estimate has a large margin of error

Median household income

$207,500*

Margin of error ±$151,231· estimate has a large margin of error

Median home value

$2,000,000+

Margin of error not available

Median gross rent

—

Margin of error not available

Median age

43.0 yrs

Margin of error ±18.1 yrs

Mean travel time to work

41.8 min*

Margin of error ±45.7 min· estimate has a large margin of error

How ZIP 94528 compares with California and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 9452843.0 yrsCalifornia37.9 yrsUnited States38.9 yrs

Median household income

ZIP 94528$207,500*California$99,122United States$80,734

Per capita income

ZIP 94528$127,901California$49,513United States$44,673

Poverty rate

ZIP 945288.1%*California12.0%United States12.5%

Unemployment rate

ZIP 945287.1%California6.6%United States5.2%

Bachelor's degree or higher

ZIP 9452879.8%*California37.1%United States35.7%

Median home value

ZIP 94528$2,000,000+California$734,700United States$332,700

Median gross rent

ZIP 94528—California$2,036/moUnited States$1,413/mo

Owner-occupied homes

ZIP 94528100.0%California55.9%United States65.2%

Mean travel time to work

ZIP 9452841.8 min*California28.7 minUnited States26.4 min

Worked from home

ZIP 945287.6%California17.2%United States15.1%

All figures for ZIP 94528

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 94528 — ACS 2020–2024 5-year estimates
MeasureZIP 94528Margin of errorCaliforniaUnited States
Total population1,049*±53139,287,377334,922,499
Median age43.0 yrs±18.1 yrs37.9 yrs38.9 yrs
Households424±15913,548,091129,227,496
Median household income$207,500*±$151,231$99,122$80,734
Per capita income$127,901±$58,629$49,513$44,673
Poverty rate8.1%*±10.4 pts12.0%12.5%
Unemployment rate7.1%±8.8 pts6.6%5.2%
Bachelor's degree or higher79.8%*±43.9 pts37.1%35.7%
Median home value$2,000,000+—$734,700$332,700
Median gross rent——$2,036/mo$1,413/mo
Owner-occupied homes100.0%±0.0 pts55.9%65.2%
Mean travel time to work41.8 min*±45.7 min28.7 min26.4 min
Worked from home7.6%±8.6 pts17.2%15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 94528
GroupZIP 94528CaliforniaUnited States
White alone, not Hispanic or Latino76.2%33.8%57.4%
Black or African American alone, not Hispanic or Latino0.0%5.2%11.9%
American Indian and Alaska Native alone, not Hispanic or Latino0.0%0.3%0.5%
Asian alone, not Hispanic or Latino6.0%15.3%5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino0.0%0.3%0.2%
Some other race alone, not Hispanic or Latino7.9%0.6%0.6%
Two or more races, not Hispanic or Latino1.8%4.4%4.3%
Hispanic or Latino (of any race)8.1%40.2%19.3%

Where ZIP 94528 is

State
California
Main county
Contra Costa County
Largest overlapping place
Diablo (100% of the ZIP's land area)
Land area
1.15 sq mi· about 912 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in Contra Costa County

94505 Discovery Bay, CA94506 Blackhawk, CA94507 Alamo, CA94509 Antioch, CA94511 Bethel Island, CA94513 Contra Costa County, CA94514 Contra Costa County, CA94516 Contra Costa County, CA94517 Contra Costa County, CA94518 Concord, CA94519 Concord, CA94520 Concord, CA94521 Concord, CA94523 Pleasant Hill, CA94525 Crockett, CA94526 Danville, CA94530 El Cerrito, CA94531 Antioch, CA94547 Hercules, CA94548 Knightsen, CA94549 Lafayette, CA94553 Martinez, CA94556 Moraga, CA94561 Oakley, CA

See every ZIP code in California, or compare ZIP 94528 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

  • U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
  • U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
  • Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.