ZIP Code 95431 — Eldridge, CA
95431 is a standard (street delivery) ZIP code serving Eldridge, 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 95431 at a glance
| ZIP code | 95431 |
|---|---|
| Primary city | Eldridge |
| State | California (CA) |
| County | Sonoma FIPS 06097 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 43 |
| Coordinates | 38.348970, -122.516250 |
How ZIP+4 works in 95431
The four digits after the hyphen encode a delivery segment inside 95431. 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 95431 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 95431.
| ZIP | City | Distance |
|---|---|---|
| 95442 | Glen Ellen, CA | 2 mi |
| 95452 | Kenwood, CA | 5.7 mi |
| 95476 | Sonoma, CA | 7.1 mi |
| 94951 | Penngrove, CA | 7.2 mi |
| 94954 | Petaluma, CA | 7.6 mi |
| 94562 | Oakville, CA | 8.1 mi |
| 94599 | Yountville, CA | 8.8 mi |
| 94573 | Rutherford, CA | 9 mi |
| 95409 | Santa Rosa, CA | 9.1 mi |
| 94928 | Rohnert Park, CA | 9.6 mi |
| 95405 | Santa Rosa, CA | 10.4 mi |
| 94931 | Cotati, CA | 10.9 mi |
Questions about 95431
What is the ZIP+4 code for 95431?
95431 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 95431, you need to look up a specific street address to get them.
What city is 95431?
95431 is assigned to Eldridge, 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.