ZIP Code 99403

99403 is one of Washington's ZIP codes, delivering to addresses in Clarkston, Asotin County.

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

Where this code sits

99403 is part of the 994xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Clarkston.

Clarkston Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99403 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99403

The ZIP codes whose reference points sit closest to 99403.
ZIP code	Distance	Delivers to
ZIP code 99179	9.2 mi	Uniontown, WA
ZIP code 83501	9.9 mi	Lewiston, ID
ZIP code 83540	13 mi	Lapwai, ID
ZIP code 83832	14 mi	Genesee, ID
ZIP code 99113	14 mi	Colton, WA
ZIP code 99402	18 mi	Asotin, WA
ZIP code 99401	18 mi	Anatone, WA
ZIP code 83524	20 mi	Culdesac, ID

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 99403, plotted from its record coordinates.

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

Scope ZIP code 99403. 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.