ZIP Code 99170

99170 is one of Washington's ZIP codes, delivering to addresses in Rosalia, Whitman County.

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

Where this code sits

99170 is part of the 991xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Rosalia.

Rosalia Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99170 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99170

The ZIP codes whose reference points sit closest to 99170.
ZIP code	Distance	Delivers to
ZIP code 99149	2.8 mi	Malden, WA
ZIP code 99176	6.8 mi	Thornton, WA
ZIP code 99158	10 mi	Oakesdale, WA
ZIP code 99039	12 mi	Waverly, WA
ZIP code 99171	13 mi	Saint John, WA
ZIP code 99018	14 mi	Latah, WA
ZIP code 99031	15 mi	Spangle, WA
ZIP code 99104	15 mi	Belmont, 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 99170, plotted from its record coordinates.

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

Scope ZIP code 99170. 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.