ZIP Code 94580 — San Lorenzo, CA
94580 is a standard (street delivery) ZIP code serving San Lorenzo, 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 94580 at a glance
| ZIP code | 94580 |
|---|---|
| Primary city | San Lorenzo |
| State | California (CA) |
| County | Alameda FIPS 06001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 29,420 |
| Coordinates | 37.678030, -122.133340 |
How ZIP+4 works in 94580
The four digits after the hyphen encode a delivery segment inside 94580. 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 94580 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.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 94580.
| ZIP | City | Distance |
|---|---|---|
| 94579 | San Leandro, CA | 1.4 mi |
| 94578 | San Leandro, CA | 2 mi |
| 94541 | Hayward, CA | 2.5 mi |
| 94577 | San Leandro, CA | 3.2 mi |
| 94545 | Hayward, CA | 3.4 mi |
| 94546 | Castro Valley, CA | 4.5 mi |
| 94603 | Oakland, CA | 4.8 mi |
| 94544 | Hayward, CA | 5.2 mi |
| 94605 | Oakland, CA | 5.8 mi |
| 94621 | Oakland, CA | 5.8 mi |
| 94542 | Hayward, CA | 6.1 mi |
| 94552 | Castro Valley, CA | 6.8 mi |
Questions about 94580
What is the ZIP+4 code for 94580?
94580 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 94580, you need to look up a specific street address to get them.
What city is 94580?
94580 is assigned to San Lorenzo, 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.