ZIP Code 98240

98240 is one of Washington's ZIP codes, delivering to addresses in Custer, Whatcom County.

City: Custer
County: Whatcom County
State: Washington
Prefix: 982xx

Where this code sits

98240 is part of the 982xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Custer.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 98240 delivers to without sharing its boundary.

ZIP codes nearest 98240

The ZIP codes whose reference points sit closest to 98240.
ZIP code	Distance	Delivers to
ZIP code 98230	5.3 mi	Blaine, WA
ZIP code 98248	5.3 mi	Ferndale, WA
ZIP code 98231	6.9 mi	Blaine, WA
ZIP code 98264	7.4 mi	Lynden, WA
ZIP code 98226	13 mi	Bellingham, WA
ZIP code 98247	13 mi	Everson, WA
ZIP code 98276	14 mi	Nooksack, WA
ZIP code 98227	14 mi	Bellingham, 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 98240, plotted from its record coordinates.

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

Scope ZIP code 98240. 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.