ZIP Code 94951 — Penngrove, CA
94951 is a standard (street delivery) ZIP code serving Penngrove, California, in Sonoma 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 94951 at a glance
| ZIP code | 94951 |
|---|---|
| Primary city | Penngrove |
| State | California (CA) |
| County | Sonoma FIPS 06097 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 3,294 |
| Coordinates | 38.322520, -122.644920 |
How ZIP+4 works in 94951
The four digits after the hyphen encode a delivery segment inside 94951. 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 94951 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 94951.
| ZIP | City | Distance |
|---|---|---|
| 94928 | Rohnert Park, CA | 3.1 mi |
| 94931 | Cotati, CA | 3.8 mi |
| 94954 | Petaluma, CA | 6.8 mi |
| 95431 | Eldridge, CA | 7.2 mi |
| 95407 | Santa Rosa, CA | 7.4 mi |
| 95442 | Glen Ellen, CA | 8 mi |
| 95405 | Santa Rosa, CA | 8.2 mi |
| 94952 | Petaluma, CA | 9 mi |
| 95452 | Kenwood, CA | 9.5 mi |
| 95409 | Santa Rosa, CA | 9.8 mi |
| 95404 | Santa Rosa, CA | 9.8 mi |
| 95476 | Sonoma, CA | 11 mi |
Questions about 94951
What is the ZIP+4 code for 94951?
94951 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 94951, you need to look up a specific street address to get them.
What city is 94951?
94951 is assigned to Penngrove, California, in Sonoma 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.