ZIP Code 99136

99136 is one of Washington's ZIP codes, delivering to addresses in Hay, Whitman County.

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

Where this code sits

99136 is part of the 991xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Hay.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99136 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99136

The ZIP codes whose reference points sit closest to 99136.
ZIP code	Distance	Delivers to
ZIP code 99143	9.6 mi	Lacrosse, WA
ZIP code 99333	11 mi	Hooper, WA
ZIP code 99359	15 mi	Starbuck, WA
ZIP code 99105	15 mi	Benge, WA
ZIP code 99371	18 mi	Washtucna, WA
ZIP code 99125	20 mi	Endicott, WA
ZIP code 99347	23 mi	Pomeroy, WA
ZIP code 99328	27 mi	Dayton, 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 99136, plotted from its record coordinates.

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

Scope ZIP code 99136. 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.