ZIP Code 92310 — Fort Irwin, CA
92310 is a standard (street delivery) ZIP code serving Fort Irwin, 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 92310 at a glance
| ZIP code | 92310 |
|---|---|
| Primary city | Fort Irwin |
| State | California (CA) |
| County | San Bernardino FIPS 06071 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 8,419 |
| Coordinates | 35.334430, -116.763060 |
How ZIP+4 works in 92310
The four digits after the hyphen encode a delivery segment inside 92310. 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 92310 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 92310.
| ZIP | City | Distance |
|---|---|---|
| 92398 | Yermo, CA | 25.4 mi |
| 92311 | Barstow, CA | 28.6 mi |
| 92327 | Daggett, CA | 32.6 mi |
| 92365 | Newberry Springs, CA | 33.2 mi |
| 92347 | Hinkley, CA | 38.5 mi |
| 93562 | Trona, CA | 41.5 mi |
| 92389 | Tecopa, CA | 44.8 mi |
Questions about 92310
What is the ZIP+4 code for 92310?
92310 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 92310, you need to look up a specific street address to get them.
What city is 92310?
92310 is assigned to Fort Irwin, 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.