ZIP Code 99143

99143 is one of Washington's ZIP codes, delivering to addresses in Lacrosse, Whitman County.

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

Where this code sits

99143 is part of the 991xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Lacrosse.

Lacrosse Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99143 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99143

The ZIP codes whose reference points sit closest to 99143.
ZIP code	Distance	Delivers to
ZIP code 99136	9.6 mi	Hay, WA
ZIP code 99125	12 mi	Endicott, WA
ZIP code 99333	18 mi	Hooper, WA
ZIP code 99105	19 mi	Benge, WA
ZIP code 99111	21 mi	Colfax, WA
ZIP code 99347	22 mi	Pomeroy, WA
ZIP code 99171	23 mi	Saint John, WA
ZIP code 99359	24 mi	Starbuck, 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 99143, plotted from its record coordinates.

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

Scope ZIP code 99143. 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.