ZIP Code 95503

95503 is one of California's ZIP codes, delivering to addresses in Eureka, Humboldt County.

City: Eureka
County: Humboldt County
State: California
Prefix: 955xx

Where this code sits

95503 is part of the 955xx range, the group of codes handled by one mail processing centre. Eureka is served by 3 ZIP codes in total; the full list, with the county each falls in, is on the Eureka page.

Eureka California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 95503 delivers to without sharing its boundary.

ZIP codes nearest 95503

The ZIP codes whose reference points sit closest to 95503.
ZIP code	Distance	Delivers to
ZIP code 95501	2.4 mi	Eureka, CA
ZIP code 95502	2.7 mi	Eureka, CA
ZIP code 95534	2.7 mi	Cutten, CA
ZIP code 95564	3.6 mi	Samoa, CA
ZIP code 95537	3.8 mi	Fields Landing, CA
ZIP code 95524	7.2 mi	Bayside, CA
ZIP code 95551	7.7 mi	Loleta, CA
ZIP code 95518	8.5 mi	Arcata, CA

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 95503, plotted from its record coordinates.

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

Scope ZIP code 95503. 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.