ZIP Code 98611

98611 is one of Washington's ZIP codes, delivering to addresses in Castle Rock, Cowlitz County.

City: Castle Rock
County: Cowlitz County
State: Washington
Prefix: 986xx

Where this code sits

98611 is part of the 986xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Castle Rock.

Castle Rock Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 98611 delivers to without sharing its boundary.

ZIP codes nearest 98611

The ZIP codes whose reference points sit closest to 98611.
ZIP code	Distance	Delivers to
ZIP code 98645	7.6 mi	Silverlake, WA
ZIP code 98593	8.6 mi	Vader, WA
ZIP code 98626	9.1 mi	Kelso, WA
ZIP code 98632	9.1 mi	Longview, WA
ZIP code 98581	9.1 mi	Ryderwood, WA
ZIP code 98591	12 mi	Toledo, WA
ZIP code 98649	13 mi	Toutle, WA
ZIP code 98609	15 mi	Carrolls, 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 98611, plotted from its record coordinates.

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

Scope ZIP code 98611. 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.