ZIP Code 92391 — Twin Peaks, CA
92391 is a standard (street delivery) ZIP code serving Twin Peaks, California, in San Bernardino 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 92391 at a glance
| ZIP code | 92391 |
|---|---|
| Primary city | Twin Peaks |
| State | California (CA) |
| County | San Bernardino FIPS 06071 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 2,254 |
| Coordinates | 34.239580, -117.236650 |
How ZIP+4 works in 92391
The four digits after the hyphen encode a delivery segment inside 92391. 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 92391 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 92391.
| ZIP | City | Distance |
|---|---|---|
| 92378 | Rimforest, CA | 0.9 mi |
| 92317 | Blue Jay, CA | 1.6 mi |
| 92385 | Skyforest, CA | 1.8 mi |
| 92325 | Crestline, CA | 2.2 mi |
| 92352 | Lake Arrowhead, CA | 3.6 mi |
| 92404 | San Bernardino, CA | 4.2 mi |
| 92322 | Cedarpines Park, CA | 5 mi |
| 92321 | Cedar Glen, CA | 5.1 mi |
| 92369 | Patton, CA | 7 mi |
| 92382 | Running Springs, CA | 7.4 mi |
| 92405 | San Bernardino, CA | 7.5 mi |
| 92346 | Highland, CA | 8.5 mi |
Questions about 92391
What is the ZIP+4 code for 92391?
92391 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 92391, you need to look up a specific street address to get them.
What city is 92391?
92391 is assigned to Twin Peaks, California, in San Bernardino 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.