ZIP Code 99115

99115 is one of Washington's ZIP codes, delivering to addresses in Coulee City, Grant County.

City: Coulee City
County: Grant County
State: Washington
Prefix: 991xx

Where this code sits

99115 is part of the 991xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Coulee City.

Coulee City Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99115 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99115

The ZIP codes whose reference points sit closest to 99115.
ZIP code	Distance	Delivers to
ZIP code 99135	9.0 mi	Hartline, WA
ZIP code 98860	9.5 mi	Wilson Creek, WA
ZIP code 98853	12 mi	Stratford, WA
ZIP code 98851	18 mi	Soap Lake, WA
ZIP code 99103	21 mi	Almira, WA
ZIP code 98830	22 mi	Mansfield, WA
ZIP code 98832	23 mi	Marlin, WA
ZIP code 99123	24 mi	Electric City, 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 99115, plotted from its record coordinates.

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

Scope ZIP code 99115. 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.