ZIP Code 99176

99176 is one of Washington's ZIP codes, delivering to addresses in Thornton, Whitman County.

City: Thornton
County: Whitman County
State: Washington
Prefix: 991xx

Where this code sits

99176 is part of the 991xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Thornton.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99176 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99176

The ZIP codes whose reference points sit closest to 99176.
ZIP code	Distance	Delivers to
ZIP code 99158	6.8 mi	Oakesdale, WA
ZIP code 99170	6.8 mi	Rosalia, WA
ZIP code 99149	8.2 mi	Malden, WA
ZIP code 99174	8.4 mi	Steptoe, WA
ZIP code 99171	9.4 mi	Saint John, WA
ZIP code 99104	10 mi	Belmont, WA
ZIP code 99130	14 mi	Garfield, WA
ZIP code 99128	15 mi	Farmington, 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 99176, plotted from its record coordinates.

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

Scope ZIP code 99176. 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.