ZIP Code 94558 — Napa, CA
94558 is a standard (street delivery) ZIP code serving Napa, California, in Napa 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 94558 at a glance
| ZIP code | 94558 |
|---|---|
| Primary city | Napa |
| State | California (CA) |
| County | Napa FIPS 06055 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 63,657 |
| Coordinates | 38.508460, -122.264970 |
How ZIP+4 works in 94558
The four digits after the hyphen encode a delivery segment inside 94558. 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 94558 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 Napa
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 94558.
| ZIP | City | Distance |
|---|---|---|
| 94574 | Saint Helena, CA | 7 mi |
| 94599 | Yountville, CA | 9 mi |
| 94573 | Rutherford, CA | 9.3 mi |
| 94562 | Oakville, CA | 9.4 mi |
| 94508 | Angwin, CA | 10.9 mi |
| 94576 | Deer Park, CA | 11.7 mi |
| 94567 | Pope Valley, CA | 14.1 mi |
| 95688 | Vacaville, CA | 14.3 mi |
| 95694 | Winters, CA | 14.5 mi |
| 95452 | Kenwood, CA | 15.6 mi |
| 95442 | Glen Ellen, CA | 16.2 mi |
| 95431 | Eldridge, CA | 17.5 mi |
Questions about 94558
What is the ZIP+4 code for 94558?
94558 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 94558, you need to look up a specific street address to get them.
What city is 94558?
94558 is assigned to Napa, California, in Napa 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.