ZIP code 94548
Where is ZIP code 94548?
Knightsen, California
Contra Costa County · PO Box only ZIP code
ZIP code 94548 belongs to Knightsen, California in Contra Costa County. 94548 is a PO Box only ZIP code: it is used for post office boxes at the Knightsen post office, not for street addresses. It is in the Pacific Time zone and uses area code 925. About 832 people live in the 94548 area, where the median household income is $189,653. The closest ZIP codes are 94561 (Oakley, 2.6 mi northwest), 94513 (Brentwood, 3.1 mi southwest) and 94511 (Bethel Island, 3.9 mi north).
| ZIP code | 94548 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Knightsen |
| State | California (CA) |
| County | Contra Costa County |
| Time zone | Pacific Time · now |
| Area code | 925 |
| Coordinates | 37.9726, -121.6652 map |
| 3-digit prefix | 945 |
Population and income in 94548
| Population | 832 · lower than 82% of California ZIP codes |
|---|---|
| People per square mile | 360 · lower than 58% of California ZIP codes |
| Median age | 44.2 years · higher than 68% of California ZIP codes |
| Men / women | 51% / 49% |
| Median household income | $189,653 · higher than 94% of California ZIP codes |
| Income per person | $64,991 |
| Below the poverty line | 9.1% |
| Bachelor’s degree or higher | 22% of adults 25+ |
| Median home value | $959,900 · higher than 74% of California ZIP codes |
| Housing units | 259 |
| Households | 259 (3.21 people on average) |
| Owners / renters | 100% / 0.0% |
| Land area | 2.31 sq mi (plus 0.09 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 94548. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 94548
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 94561 | Oakley, CA | 2.6 mi NW | Standard |
| 94513 | Brentwood, CA | 3.1 mi SW | Standard |
| 94511 | Bethel Island, CA | 3.9 mi N | PO Box only |
| 94531 | Antioch, CA | 6 mi W | Standard |
| 94505 | Discovery Bay, CA | 6 mi SE | Standard |
| 94509 | Antioch, CA | 8 mi W | Standard |
| 94514 | Byron, CA | 10.4 mi S | Standard |
| 95208 | Stockton, CA | 12.8 mi E | PO Box only |
| 95641 | Isleton, CA | 13.1 mi N | Standard |
| 95234 | Holt, CA | 13.3 mi E | PO Box only |
| 94571 | Rio Vista, CA | 13.4 mi N | Standard |
| 94565 | Pittsburg, CA | 13.9 mi W | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 94548 or measure the distance to another ZIP code.
How to address mail to 94548
PO BOX 123
KNIGHTSEN CA 94548
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (94548-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 94548?
- 94548 is a Knightsen, California ZIP code.
- What county is 94548 in?
- ZIP code 94548 is in Contra Costa County, California.
- What time zone is ZIP code 94548 in?
- 94548 is in the Pacific Time zone (America/Los_Angeles).
- What area code is 94548?
- Phone numbers in ZIP code 94548 use area code 925.
- What is the population of ZIP code 94548?
- About 832 people live in ZIP code 94548, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 94548?
- The median household income in 94548 is $189,653 a year, higher than 94% of California ZIP codes.
- Can I use 94548 for a street address?
- No. 94548 is only for PO Boxes. Street addresses in Knightsen use another ZIP code.
- What ZIP codes are near 94548?
- The nearest ZIP codes to 94548 are 94561 (Oakley, 2.6 miles), 94513 (Brentwood, 3.1 miles), 94511 (Bethel Island, 3.9 miles) and 94531 (Antioch, 6 miles).