ZIP Code 99116

99116 is one of Washington's ZIP codes, delivering to addresses in Coulee Dam, Okanogan County.

City: Coulee Dam
County: Okanogan County
State: Washington
Prefix: 991xx

Where this code sits

99116 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 Dam.

Coulee Dam Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99116 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99116

The ZIP codes whose reference points sit closest to 99116.
ZIP code	Distance	Delivers to
ZIP code 99124	2.8 mi	Elmer City, WA
ZIP code 99133	7.3 mi	Grand Coulee, WA
ZIP code 99155	7.9 mi	Nespelem, WA
ZIP code 99123	9.8 mi	Electric City, WA
ZIP code 99140	13 mi	Keller, WA
ZIP code 99103	19 mi	Almira, WA
ZIP code 99185	23 mi	Wilbur, WA
ZIP code 98830	23 mi	Mansfield, 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 99116, plotted from its record coordinates.

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

Scope ZIP code 99116. 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.