ZIP Code 99111

99111 is one of Washington's ZIP codes, delivering to addresses in Colfax, Whitman County.

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

Where this code sits

99111 is part of the 991xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Colfax.

Colfax Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99111 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99111

The ZIP codes whose reference points sit closest to 99111.
ZIP code	Distance	Delivers to
ZIP code 99102	8.2 mi	Albion, WA
ZIP code 99174	8.7 mi	Steptoe, WA
ZIP code 99130	13 mi	Garfield, WA
ZIP code 99161	13 mi	Palouse, WA
ZIP code 99164	14 mi	Pullman, WA
ZIP code 99163	14 mi	Pullman, WA
ZIP code 99104	16 mi	Belmont, WA
ZIP code 99171	17 mi	Saint John, 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 99111, plotted from its record coordinates.

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

Scope ZIP code 99111. 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.