99402 ZIP Code: Asotin, Washington
ZIP code 99402 covers Asotin, Washington. It sits in Asotin County. A ZIP code is a US Postal Service mail route, not a boundary on a map, so it describes where post is delivered rather than an administrative area.
| ZIP code | 99402 |
|---|---|
| Place | Asotin |
| State | Washington (WA) |
| County or equivalent | Asotin County |
| Phone area codes in Washington | 6 |
| Country | United States |
ZIP codes near 99402
- 99401 Anatoneabout 4 miles
- 83501 Lewiston, IDabout 17 miles
- 99403 Clarkstonabout 18 miles
- 83555 Winchester, IDabout 20 miles
- 83540 Lapwai, IDabout 22 miles
- 83524 Culdesac, IDabout 24 miles
- 83548 Reubens, IDabout 26 miles
- 83523 Craigmont, IDabout 27 miles
Distances are straight-line, between the approximate centres of each delivery area.
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Frequently asked questions
Where is ZIP code 99402?
ZIP code 99402 is in Asotin, Washington, in Asotin County. ZIP codes are mail delivery routes rather than mapped regions, so the code identifies a set of addresses the Postal Service serves together, not a district with fixed borders.
What county is 99402 in?
99402 is in Asotin County, Washington. A single ZIP code can straddle a county line, because mail routes were drawn for delivery efficiency and take no notice of county boundaries, so the county shown is the one the code is primarily associated with.
What area code goes with ZIP code 99402?
ZIP codes and telephone area codes are separate systems with different boundaries, so no ZIP code maps to exactly one area code. Washington uses 6 geographic area codes: 206, 253, 360, 425, 509 and 564.
Is 99402 a real ZIP code?
Yes. 99402 appears in the GeoNames postal-code dataset as an active US code assigned to Asotin, Washington. Codes that have been retired or never issued do not appear, which is why entering one on this site returns a not-found page rather than a blank record.
Why do ZIP code boundaries look odd on maps?
Because they are not boundaries. A ZIP code is a collection of mail routes, and a route is a line a carrier walks or drives, not an area. Any ZIP code map you have seen is somebody's approximation drawn around the addresses in a code, which is also why two ZIP code maps rarely agree with each other.
Can two addresses in the same ZIP code be in different cities?
Yes, routinely. The Postal Service assigns a preferred city name to each code for addressing purposes, and that name often covers several neighbouring towns, unincorporated areas or a whole postal district. The place shown here is the one the source names for the code, not a claim that every address in it is inside that town's limits.
ZIP code, place, county and location data from GeoNames, used under CC BY 4.0, extracted 2026-08-22. ZIP codes are Postal Service delivery routes, not administrative areas, so a code can cross city and county lines and the place name shown is the one the source records for the code. Coordinates are an approximate centre of the delivery area, not a precise location. Population and time zone are not shown because the source does not publish them.