ZIP codes

ZIP codes in Humboldt County, California

Humboldt County has 36 ZIP codes. 31 lie entirely inside it and 5 are shared with neighboring counties, so part of their land and their people are elsewhere. About 134,714 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 36; With 1% or more of their land inside
Entirely inside: 31; 99% or more of their land
Shared with other counties: 5; Most with Mendocino County (2)
Most populated ZIP: 95503; 25,054 people · Pine Hills
Least populated ZIP: 95559; 41 people · Phillipsville
Largest ZIP by land: 95542; 220 sq mi · Benbow

Map of the ZIP codes in Humboldt County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Humboldt County

36 ZIP codes in Humboldt County, CA, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
95501	Eureka	22,890	100%	22,890
95503	Pine Hills	25,054	100%	25,054
95511	Alderpoint	71	100%	71
95514	—	85	100%	85
95519	McKinleyville	18,728	100%	18,728
95521	Arcata	21,980	100%	21,980
95524	Indianola	1,634	100%	1,634
95525	Blue Lake	1,441	100%	1,441
95526	Mad River	745	86%	≈ 710
95528	—	1,286	100%	1,286
95536	Ferndale	3,050	100%	3,050
95537	Fields Landing	532	100%	532
95540	Fortuna	14,469	100%	14,469
95542	Benbow	2,463	97%	≈ 2,434
95545	—	194	100%	194
95546	Hoopa	2,397	100%	2,397
95547	Hydesville	1,263	100%	1,263
95549	—	1,024	100%	1,024
95550	—	140	100%	140
95551	Loleta	1,880	100%	1,880
95552	Ruth	586	6.8%	≈ 186
95553	Miranda	789	100%	789
95554	Myers Flat	368	100%	368
95555	Orick	216	100%	216
95556	—	949	89%	≈ 887
95558	—	230	100%	230
95559	Phillipsville	41	100%	41
95560	Redway	1,213	100%	1,213
95562	Rio Dell	3,422	100%	3,422
95564	Samoa	444	100%	444
95565	Scotia	764	100%	764
95569	Redcrest	99	100%	99
95570	Westhaven-Moonstone	2,640	100%	2,640
95571	Weott	104	100%	104
95573	Willow Creek	1,089	100%	1,089
95589	Shelter Cove	1,115	79%	≈ 960

ZIP codes shared with other counties

These 5 ZIP codes have part of their land in another county. The first figure is the share of their land in Humboldt County; then, where the rest lies.

95526 (Mad River): 86% here; 14% in Trinity County.
95542 (Benbow): 97% here; 2.8% in Mendocino County.
95552 (Ruth): 6.8% here; 93% in Trinity County.
95556: 89% here; 11% in Siskiyou County.
95589 (Shelter Cove): 79% here; 21% in Mendocino County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Alderpoint (1), Arcata (1), Benbow (1), Blue Lake (1), Eureka (1), and Ferndale (1); 29 places in all.

All 36 start with the same three digits, 955: the prefix of the USPS sorting center that handles them.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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