ZIP code 94528
Where is ZIP code 94528?
Diablo, California
Contra Costa County · PO Box only ZIP code
ZIP code 94528 belongs to Diablo, California in Contra Costa County. 94528 is a PO Box only ZIP code: it is used for post office boxes at the Diablo post office, not for street addresses. It is in the Pacific Time zone and uses area code 925. About 1,049 people live in the 94528 area, where the median household income is $207,500. The closest ZIP codes are 94526 (Danville, 1.7 mi south), 94506 (Danville, 2.8 mi east) and 94507 (Alamo, 3.2 mi west).
| ZIP code | 94528 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Diablo |
| State | California (CA) |
| County | Contra Costa County |
| Time zone | Pacific Time · now |
| Area code | 925 |
| Coordinates | 37.8387, -121.9667 map |
| 3-digit prefix | 945 |
Population and income in 94528
| Population | 1,049 · lower than 80% of California ZIP codes |
|---|---|
| People per square mile | 909 · higher than 51% of California ZIP codes |
| Median age | 43 years · higher than 63% of California ZIP codes |
| Men / women | 43% / 57% |
| Median household income | $207,500 · higher than 97% of California ZIP codes |
| Income per person | $127,901 |
| Below the poverty line | 8.1% |
| Bachelor’s degree or higher | 80% of adults 25+ |
| Median home value | $2,000,001 · higher than 98% of California ZIP codes |
| Housing units | 463 |
| Households | 424 (2.47 people on average) |
| Owners / renters | 100% / 0.0% |
| Land area | 1.15 sq mi |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 94528. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 94528
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 94526 | Danville, CA | 1.7 mi S | Standard |
| 94506 | Danville, CA | 2.8 mi E | Standard |
| 94507 | Alamo, CA | 3.2 mi W | Standard |
| 94570 | Moraga, CA | 4.3 mi S | PO Box only |
| 94575 | Moraga, CA | 4.3 mi S | Standard |
| 94583 | San Ramon, CA | 5.8 mi S | Standard |
| 94582 | San Ramon, CA | 5.9 mi SE | Standard |
| 94517 | Clayton, CA | 6.1 mi NE | Standard |
| 94595 | Walnut Creek, CA | 6.2 mi NW | Standard |
| 94598 | Walnut Creek, CA | 6.4 mi NW | Standard |
| 94596 | Walnut Creek, CA | 6.7 mi NW | Standard |
| 94597 | Walnut Creek, CA | 7.9 mi NW | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 94528 or measure the distance to another ZIP code.
How to address mail to 94528
PO BOX 123
DIABLO CA 94528
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (94528-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 94528?
- 94528 is a Diablo, California ZIP code.
- What county is 94528 in?
- ZIP code 94528 is in Contra Costa County, California.
- What time zone is ZIP code 94528 in?
- 94528 is in the Pacific Time zone (America/Los_Angeles).
- What area code is 94528?
- Phone numbers in ZIP code 94528 use area code 925.
- What is the population of ZIP code 94528?
- About 1,049 people live in ZIP code 94528, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 94528?
- The median household income in 94528 is $207,500 a year, higher than 97% of California ZIP codes.
- Can I use 94528 for a street address?
- No. 94528 is only for PO Boxes. Street addresses in Diablo use another ZIP code.
- What ZIP codes are near 94528?
- The nearest ZIP codes to 94528 are 94526 (Danville, 1.7 miles), 94506 (Danville, 2.8 miles), 94507 (Alamo, 3.2 miles) and 94570 (Moraga, 4.3 miles).