ZIP Code 99133

99133 is one of Washington's ZIP codes, delivering to addresses in Grand Coulee, Grant County.

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

Where this code sits

99133 is part of the 991xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Grand Coulee.

Grand Coulee Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99133 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99133

The ZIP codes whose reference points sit closest to 99133.
ZIP code	Distance	Delivers to
ZIP code 99123	2.7 mi	Electric City, WA
ZIP code 99124	4.6 mi	Elmer City, WA
ZIP code 99116	7.3 mi	Coulee Dam, WA
ZIP code 99103	13 mi	Almira, WA
ZIP code 99155	14 mi	Nespelem, WA
ZIP code 99140	17 mi	Keller, WA
ZIP code 98830	19 mi	Mansfield, WA
ZIP code 99185	19 mi	Wilbur, 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 99133, plotted from its record coordinates.

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

Scope ZIP code 99133. 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.