ZIP Code 95430 — Duncans Mills, CA
95430 is a standard (street delivery) ZIP code serving Duncans Mills, 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 95430 at a glance
| ZIP code | 95430 |
|---|---|
| Primary city | Duncans Mills |
| State | California (CA) |
| County | Sonoma FIPS 06097 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Coordinates | 38.462790, -123.044760 |
How ZIP+4 works in 95430
The four digits after the hyphen encode a delivery segment inside 95430. 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 95430 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 95430.
| ZIP | City | Distance |
|---|---|---|
| 95486 | Villa Grande, CA | 1.4 mi |
| 95462 | Monte Rio, CA | 1.5 mi |
| 95465 | Occidental, CA | 4.2 mi |
| 95446 | Guerneville, CA | 4.8 mi |
| 95419 | Camp Meeker, CA | 5.4 mi |
| 95471 | Rio Nido, CA | 6.1 mi |
| 95436 | Forestville, CA | 7.3 mi |
| 94923 | Bodega Bay, CA | 8.8 mi |
| 94922 | Bodega, CA | 8.9 mi |
| 95444 | Graton, CA | 9.7 mi |
| 95450 | Jenner, CA | 10.1 mi |
| 94972 | Valley Ford, CA | 10.4 mi |
Questions about 95430
What is the ZIP+4 code for 95430?
95430 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 95430, you need to look up a specific street address to get them.
What city is 95430?
95430 is assigned to Duncans Mills, 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.