ZIP Code 98603

98603 is one of Washington's ZIP codes, delivering to addresses in Ariel, Cowlitz County.

City: Ariel
County: Cowlitz County
State: Washington
Prefix: 986xx

Where this code sits

98603 is part of the 986xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Ariel.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 98603 delivers to without sharing its boundary.

ZIP codes nearest 98603

The ZIP codes whose reference points sit closest to 98603.
ZIP code	Distance	Delivers to
ZIP code 98601	5.3 mi	Amboy, WA
ZIP code 98616	9.0 mi	Cougar, WA
ZIP code 98675	9.4 mi	Yacolt, WA
ZIP code 98629	11 mi	La Center, WA
ZIP code 98622	12 mi	Heisson, WA
ZIP code 98674	13 mi	Woodland, WA
ZIP code 98604	15 mi	Battle Ground, WA
ZIP code 98625	17 mi	Kalama, 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 98603, plotted from its record coordinates.

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

Scope ZIP code 98603. 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.