PlainZIP

Diablo, CA · standard

ZIP Code 94528

Contra Costa County, California - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

964
159/sq mi
$207,500
Median income
$2,000,000+
Median home value
79.8%
Bachelor's or higher

The verdict

Diablo pairs a top-decile household income with top-decile home values, in a rural, homeowner-dominated area.

Top 1%
household income, US ZIPs
Top 1%
home value, US ZIPs
159
people per sq mi
100%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 94528 against every reporting US ZIP.

ZIP code 94528 is a sparsely populated ZIP (a standard USPS delivery area) in Diablo, Contra Costa County, California, home to just 964 residents across 6.1 square miles, a density of 159 people per square mile, in the Los Angeles time zone.

ZIP 94528 skews affluent, with a median household income of $207,500 (104% above the California average), while per-capita income is $127,901. Local economic indicators show a 8.1% poverty rate alongside 7.1% unemployment. On housing, the median home value is $2,000,000+ (159% above the state average) with median rent at - per month, and 100.0% of occupied units are owner-occupied.

This is a highly-educated ZIP: 79.8% of adults hold a bachelor's degree or higher, the median age is 43, and the average commute is -. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Contra Costa County, so you can benchmark 94528 against its immediate geography rather than a national average alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 94528

Top 5 sectors by establishment count in Diablo, CA

Which industries have the most business establishments in ZIP 94528.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 94528, Diablo, CA · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

964

Population

6.1

Area (sq mi)

159

People / sq mi

Los Angeles

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 94528?

43.0

Median Age

43.2%

Male

56.8%

Female

14.4%

Foreign-Born

White 81.8%
African American 0.0%
Asian 6.0%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 4.3%
Hispanic or Latino 8.1%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$207,500

Median Household Income

+104% vs state

$127,901

Per Capita Income

8.1%

Poverty Rate

7.1%

Unemployment Rate

How ZIP 94528 ranks nationally

Diablo, CA household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$207,500 Top 1% higher than 99% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Below this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Below this entry. $140,000–$160,000: 686 US ZIPs (2%). Below this entry. $160,000–$180,000: 364 US ZIPs (1%). Below this entry. $180,000–$200,000: 186 US ZIPs (1%). Below this entry. $200,000–$220,000: 324 US ZIPs (1%). This entry sits in this band. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 79.8%
Bachelor's Degree or Higher 79.8%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

463

Total Housing Units

424

Occupied Units

39

Vacant Units

2.47

Avg Household Size

Occupancy Type

Owner 100.0%
Renter 0.0%

$2,000,000+

Median Home Value

+159% vs state

1980

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 22 business establishments in ZIP 94528, employing approximately 170 people with a combined annual payroll of $13,196,000.

22

Businesses

170

Employees

$13.2M

Annual Payroll

3

Industry Sectors

Industry Establishments % of Total
Real estate and rental and leasing 5 22.7%
Professional, scientific, and technical services 4 18.2%
Arts, entertainment, and recreation 3 13.6%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 94528 vs 94526 →

ZIP 94528 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 94528 ranks #0 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 94528 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 94528 ranks #5 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
94526 Danville, CA 31,102 3.1 mi
94507 Alamo, CA 14,889 3.9 mi
94506 Danville, CA 22,452 3.5 mi
94598 Walnut Creek, CA 25,818 4.7 mi
94583 San Ramon, CA 34,859 6.4 mi
94521 Concord, CA 41,249 7.6 mi
94517 Clayton, CA 12,385 5.0 mi
94582 San Ramon, CA 38,537 6.0 mi
94596 Walnut Creek, CA 20,037 5.6 mi
94595 Walnut Creek, CA 16,425 6.7 mi

More ZIP Codes in Contra Costa County

94565 standard
Pittsburg, CA
Pop: 84,641
94509 standard
Antioch, CA
Pop: 62,439
94806 standard
San Pablo, CA
Pop: 59,861
94513 standard
Brentwood, CA
Pop: 54,605
94553 standard
Martinez, CA
Pop: 47,065
94521 standard
Concord, CA
Pop: 41,249

Related Areas

Contra Costa County Diablo, CA California

Frequently Asked Questions

What county is ZIP code 94528 in? ▼
ZIP code 94528 (Diablo) is located in Contra Costa County, California. Contra Costa County contains multiple ZIP codes, see the full list at /counties/contra-costa-ca.
What is the population of ZIP code 94528? ▼
ZIP code 94528 in Diablo, CA has a population of 964 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 94528? ▼
The median household income in ZIP 94528 is $207,500, which is 172% above the national average of $76,288.
What is the average home value in ZIP 94528? ▼
The median home value in ZIP 94528 is $2,000,000+, which is 619% above the national average of $278,155.
What is the demographic makeup of ZIP 94528? ▼
The largest racial group in ZIP 94528 is White at 81.8%. Hispanic or Latino residents make up 8.1% of the population.
How many businesses are in ZIP code 94528? ▼
ZIP code 94528 has 22 business establishments employing approximately 170 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 94528? ▼
The top industries by establishment count in ZIP 94528 are: Real estate and rental and leasing (5), Professional, scientific, and technical services (4), Arts, entertainment, and recreation (3). There are 3 industry sectors represented in total.
What is the education level in ZIP code 94528? ▼
In ZIP code 94528, 79.8% of residents aged 25+ have a high school diploma or higher, and 79.8% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the poverty rate in ZIP code 94528? ▼
The poverty rate in ZIP code 94528 is 8.1% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.