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 High-density area
- $207,500
- Median income Above-median income area
- $2,000,000+
- Median home value Above-median home value
- 79.8%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
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 average California ZIP), while per-capita income is $127,901. The poverty rate is 8.1%, with unemployment at 7.1%; those measures add context to the income figure. Housing is both higher-cost and owner-heavy: median home value is $2,000,000+ (159% above the average California ZIP), while 100.0% of occupied homes 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 -. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Contra Costa County, so 94528 can be compared with both its immediate and county-level context.
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.
- Real estate and rental and leasing
Real estate and rental and leasing
5 establishments
- Professional, scientific, and technical services
Professional, scientific, and technical services
4 establishments
- Arts, entertainment, and recreation
Arts, entertainment, and recreation
3 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, 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
Who lives in ZIP 94528?
43.0
Median Age
43.2%
Male
56.8%
Female
14.4%
Foreign-Born
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 ZIP avg
$127,901
Per Capita Income
8.1%
Poverty Rate
7.1%
Unemployment Rate
How ZIP 94528 ranks among California ZIPs
Diablo, CA household income vs. every California ZIP code
Median household income among 1,583 reporting California ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$207,500 Top 3% higher than 97% of 1,583 California ZIPs
Each bar is a $20K-wide band; taller bars hold more California 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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
463housing units
463
Total Housing Units
424
Occupied Units
39
Vacant Units
2.47
Avg Household Size
Occupancy Type
$2,000,000+
Median Home Value
+159% vs state ZIP avg
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.
- 94521
Concord (94521)
41,249 residents
- 94582
San Ramon (94582)
38,537 residents
- 94583
San Ramon (94583)
34,859 residents
- 94526
Danville (94526)
31,102 residents
- 94598
Walnut Creek (94598)
25,818 residents
- 94506
Danville (94506)
22,452 residents
- 94596
Walnut Creek (94596)
20,037 residents
- 94595 16,425
Walnut Creek (94595)
16,425 residents
- 94507 14,889
Alamo (94507)
14,889 residents
What this shows Among its immediate neighbors, ZIP 94528 ranks #0 by population - useful context the national average alone can't give.
ZIP 94528 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 94506
Danville (94506)
$250,000 median income
- 94507
Alamo (94507)
$250,000 median income
- 94526
Danville (94526)
$225,097 median income
- 94582
San Ramon (94582)
$214,677 median income
- 94528
Diablo (94528)
$207,500 median income
- 94598
Walnut Creek (94598)
$186,225 median income
- 94583
San Ramon (94583)
$184,898 median income
- 94517
Clayton (94517)
$168,921 median income
- 94596
Walnut Creek (94596)
$135,635 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.
| 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 |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 94528, both outside CA so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Contra Costa County
Related Areas
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.
Related
Take this with you
What to do with ZIP 94528's numbers, next.
- See how ZIP 94528 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Diablo, CA ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.