ZIP Code 99402 — Asotin, WA
99402 is a standard (street delivery) ZIP code serving Asotin, Washington, in Asotin 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 99402 at a glance
| ZIP code | 99402 |
|---|---|
| Primary city | Asotin |
| State | Washington (WA) |
| County | Asotin FIPS 53003 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 1,557 |
| Coordinates | 46.186800, -117.149220 |
How ZIP+4 works in 99402
The four digits after the hyphen encode a delivery segment inside 99402. 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 99402 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 99402.
| ZIP | City | Distance |
|---|---|---|
| 99401 | Anatone, WA | 8.9 mi |
| 83501 | Lewiston, ID | 12 mi |
| 99403 | Clarkston, WA | 14.4 mi |
| 83540 | Lapwai, ID | 20.7 mi |
| 99179 | Uniontown, WA | 21.2 mi |
| 83555 | Winchester, ID | 21.5 mi |
| 99347 | Pomeroy, WA | 26 mi |
| 83524 | Culdesac, ID | 26.4 mi |
| 99113 | Colton, WA | 27.6 mi |
| 83832 | Genesee, ID | 27.7 mi |
| 83535 | Juliaetta, ID | 31.7 mi |
| 97828 | Enterprise, OR | 33.1 mi |
Questions about 99402
What is the ZIP+4 code for 99402?
99402 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 99402, you need to look up a specific street address to get them.
What city is 99402?
99402 is assigned to Asotin, Washington, in Asotin 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.