ZIP Code 99402

99402 is one of Washington's ZIP codes, delivering to addresses in Asotin, Asotin County.

City: Asotin
County: Asotin County
State: Washington
Prefix: 994xx

Where this code sits

99402 is part of the 994xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Asotin.

Asotin Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99402 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99402

The ZIP codes whose reference points sit closest to 99402.
ZIP code	Distance	Delivers to
ZIP code 99401	4.2 mi	Anatone, WA
ZIP code 83501	17 mi	Lewiston, ID
ZIP code 99403	18 mi	Clarkston, WA
ZIP code 83555	20 mi	Winchester, ID
ZIP code 83540	22 mi	Lapwai, ID
ZIP code 83524	24 mi	Culdesac, ID
ZIP code 83548	26 mi	Reubens, ID
ZIP code 99179	27 mi	Uniontown, WA

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 99402, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 99402. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.