ZIP Code 94551 — Livermore, CA
94551 is a standard (street delivery) ZIP code serving Livermore, California, in Alameda County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 94551 at a glance
| ZIP code | 94551 |
|---|---|
| Primary city | Livermore |
| State | California (CA) |
| County | Alameda FIPS 06001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 37,885 |
| Coordinates | 37.759020, -121.760260 |
How ZIP+4 works in 94551
The four digits after the hyphen encode a delivery segment inside 94551. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 94551 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Other ZIP codes in Livermore
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 94551.
| ZIP | City | Distance |
|---|---|---|
| 94588 | Pleasanton, CA | 6.8 mi |
| 94568 | Dublin, CA | 8.2 mi |
| 94582 | San Ramon, CA | 8.4 mi |
| 94514 | Byron, CA | 8.5 mi |
| 94506 | Danville, CA | 8.6 mi |
| 94566 | Pleasanton, CA | 9.2 mi |
| 95391 | Tracy, CA | 9.3 mi |
| 94517 | Clayton, CA | 11.4 mi |
| 94505 | Discovery Bay, CA | 12 mi |
| 94528 | Diablo, CA | 12.2 mi |
| 94513 | Brentwood, CA | 12.2 mi |
| 94583 | San Ramon, CA | 12.7 mi |
Questions about 94551
What is the ZIP+4 code for 94551?
94551 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 94551, you need to look up a specific street address to get them.
What city is 94551?
94551 is assigned to Livermore, California, in Alameda County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.