ZIP Code 99166

99166 is one of Washington's ZIP codes, delivering to addresses in Republic, Ferry County.

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

Where this code sits

99166 is part of the 991xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Republic.

Republic Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99166 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99166

The ZIP codes whose reference points sit closest to 99166.
ZIP code	Distance	Delivers to
ZIP code 99150	11 mi	Malo, WA
ZIP code 98859	15 mi	Wauconda, WA
ZIP code 99118	17 mi	Curlew, WA
ZIP code 99121	23 mi	Danville, WA
ZIP code 99160	26 mi	Orient, WA
ZIP code 99107	26 mi	Boyds, WA
ZIP code 99151	29 mi	Marcus, WA
ZIP code 99141	30 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 99166, plotted from its record coordinates.

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

Scope ZIP code 99166. 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.