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Zip Code 98240 — Custer, WA

98240 is a ZIP Code associated with Custer, WA, located within Whatcom. The postal region supports an estimated population of 3,593 residents across Data Pending housing units, with a population density of 62.3 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (48.947110, -122.620610)

Data Metric	Local Statistic
Postal / Zip Code	98240
Primary City	Custer
State / Province	WA
County	Whatcom
Total Population	3,593
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	62.3 people/sq mi
Timezone	America/Los_Angeles

How 98240 Compares

Metric	ZIP 98240	Whatcom County	WA State Average
Population	3,593	228,909	7,816,021
Median Income	Data Pending	N/A	N/A
Population Density	62.3 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 98230	Blaine	4.0 mi	18,744	N/A
Zip 98248	Ferndale	5.7 mi	28,498	N/A
Zip 98264	Lynden	7.4 mi	23,123	N/A
Zip 98226	Bellingham	13.5 mi	46,782	N/A
Zip 98276	Nooksack	13.7 mi	1,794	N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →