94528 ZIP Code, Diablo, CA
94528 is a ZIP code in Diablo, California in Contra Costa County. It covers 1.2 square miles of land. The closest ZIP codes are 94526, 94507 and 94506. 1,049 people live here in 424 households. With about 909 people per square mile it is lightly settled, and most homes are owner-occupied (100%). Median household income is $207,500, well above the California median of $99,122.
Quick facts
- Mailing city: Diablo, CA
- County: Contra Costa County
- Land area: 1.2 sq mi
- Population: 1,049
- Median household income: $207,500
Key figures
| Measure | Value |
|---|---|
| Residents | 1,049 |
| Households | 424 |
| Median household income | $207,500 |
| Income per person | $127,901 |
| Median age | 43 |
| Homeowners | 100.0% |
| Median home value | $2,000,000+ |
| Median rent | not published |
| Bachelor's degree or higher | 79.8% |
| Average commute (minutes) | 41.8 |
| Households with kids under 18 | 31.4% |
| Moved in the past year | 3.0% |
| Below the poverty line | 8.1% |
| Broadband internet | 100.0% |
| Speak a non-English language at home | 16.0% |
Household income
| % of households | Value |
|---|---|
| <$10K | 6.1% |
| $10–15K | 0.0% |
| $15–25K | 9.7% |
| $25–35K | 5.4% |
| $35–50K | 0.0% |
| $50–75K | 8.5% |
| $75–100K | 4.7% |
| $100–150K | 0.0% |
| $150–200K | 15.6% |
| $200K+ | 50.0% |
Age
| % of all residents | Value |
|---|---|
| <10 | 19.6% |
| 10–19 | 8.0% |
| 20–24 | 3.0% |
| 25–34 | 0.0% |
| 35–44 | 27.3% |
| 45–54 | 4.5% |
| 55–64 | 15.0% |
| 65–74 | 1.9% |
| 75+ | 20.6% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 42.9% |
| Owned outright | 48.8% |
| Rented | 0.0% |
| Vacant | 8.2% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 91.8% |
| Townhome | 8.2% |
| 2–4 units | 0.0% |
| 5–19 units | 0.0% |
| 20+ units | 0.0% |
| Mobile / other | 0.0% |
Businesses in 94528
22 business establishments with 170 employees (ZIP Codes Business Patterns 2023).
- Real Estate and Rental and Leasing: 5
- Professional, Scientific, and Technical Services: 4
- Arts, Entertainment, and Recreation: 3
EDDM carrier routes
See every USPS carrier route in 94528 with residential and business mailbox counts on the route map. Open the EDDM route map.
Nearby ZIP codes
- 94526 — Danville town, CA (2.3 mi)
- 94507 — Alamo CDP, CA (2.8 mi)
- 94506 — Blackhawk CDP, CA (3.9 mi)
- 94517 — Clayton city, CA (4.9 mi)
- 94583 — San Ramon city, CA (5.1 mi)
- 94596 — Walnut Creek city, CA (5.4 mi)
- 94582 — San Ramon city, CA (5.8 mi)
- 94598 — Walnut Creek city, CA (6.1 mi)
Areas that include 94528
- Diablo, CA ZIP codes — 2 ZIP codes
- Contra Costa County ZIP codes — 47 ZIP codes
- California ZIP code data
Where it ranks
- No. 10 of 43: highest median household income in Contra Costa County
- No. 3 of 43: highest median home value in Contra Costa County
- No. 1 of 43: highest share of owner-occupied homes in Contra Costa County
Mail every home in 94528
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 94528, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 94528 in?
- 94528 is a Diablo, CA mailing address. By land area, 100% lies inside Diablo.
- What county is 94528 in?
- 94528 is in Contra Costa County.
- What is the population of 94528?
- About 1,049 people (±531), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 1,054.
- What is the median household income in 94528?
- $207,500 (±$151,231), compared with $99,122 for California as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 94528?
- EDDM2GO's stored route library does not include 94528 yet. The EDDM route map loads its carrier routes and mailbox counts when you search the ZIP code.
- What ZIP codes are near 94528?
- The closest, measured center to center: 94526 (2.3 mi, Danville), 94507 (2.8 mi, Alamo), 94506 (3.9 mi, Blackhawk), 94517 (4.9 mi, Clayton), 94583 (5.1 mi, San Ramon) and 94596 (5.4 mi, Walnut Creek).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.