ZIP Code 95666 — Pioneer, CA
95666 is a standard (street delivery) ZIP code serving Pioneer, California, in Amador 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 95666 at a glance
| ZIP code | 95666 |
|---|---|
| Primary city | Pioneer |
| State | California (CA) |
| County | Amador FIPS 06005 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 5,994 |
| Coordinates | 38.541130, -120.330760 |
How ZIP+4 works in 95666
The four digits after the hyphen encode a delivery segment inside 95666. 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 95666 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 95666.
| ZIP | City | Distance |
|---|---|---|
| 95255 | West Point, CA | 11.4 mi |
| 95636 | Grizzly Flats, CA | 11.8 mi |
| 95684 | Somerset, CA | 12.4 mi |
| 95257 | Wilseyville, CA | 12.9 mi |
| 95726 | Pollock Pines, CA | 15.5 mi |
| 95689 | Volcano, CA | 16.1 mi |
| 95248 | Rail Road Flat, CA | 16.5 mi |
| 95232 | Glencoe, CA | 18.2 mi |
| 95646 | Kirkwood, CA | 18.2 mi |
| 95629 | Fiddletown, CA | 19.4 mi |
| 96155 | South Lake Tahoe, CA | 19.5 mi |
| 95665 | Pine Grove, CA | 20 mi |
Questions about 95666
What is the ZIP+4 code for 95666?
95666 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 95666, you need to look up a specific street address to get them.
What city is 95666?
95666 is assigned to Pioneer, California, in Amador 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.