ZIP Code 99138

99138 is one of Washington's ZIP codes, delivering to addresses in Inchelium, Ferry County.

City: Inchelium
County: Ferry County
State: Washington
Prefix: 991xx

Where this code sits

99138 is part of the 991xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Inchelium.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99138 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99138

The ZIP codes whose reference points sit closest to 99138.
ZIP code	Distance	Delivers to
ZIP code 99131	11 mi	Gifford, WA
ZIP code 99167	13 mi	Rice, WA
ZIP code 99137	14 mi	Hunters, WA
ZIP code 99101	19 mi	Addy, WA
ZIP code 99129	23 mi	Fruitland, WA
ZIP code 99140	23 mi	Keller, WA
ZIP code 99109	27 mi	Chewelah, WA
ZIP code 99141	28 mi	Kettle Falls, 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 99138, plotted from its record coordinates.

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

Scope ZIP code 99138. 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.