Humboldt County, CA ZIP Codes & Directory
Complete postal guide for Humboldt County, California. Featuring the official county seat of Eureka, largest municipality Eureka, and serving 28 incorporated municipal entities.
Municipalities Located in Humboldt County
Incorporated Cities, Towns, and Villages
Alderpoint
cityZIPs: 95511
Arcata
cityZIPs: 95521
Bayside
cityZIPs: 95524
Blocksburg
cityZIPs: 95514
Blue Lake
cityZIPs: 95525
Bridgeville
cityZIPs: 95526
Carlotta
cityZIPs: 95528
Eureka
cityZIPs: 95501, 95503
Ferndale
cityZIPs: 95536
Fortuna
cityZIPs: 95540
Garberville
cityZIPs: 95542
Hoopa
cityZIPs: 95546
Hydesville
cityZIPs: 95547
Kneeland
cityZIPs: 95549
Korbel
cityZIPs: 95550
Loleta
cityZIPs: 95551
Mckinleyville
cityZIPs: 95519
Myers Flat
cityZIPs: 95554
Orick
cityZIPs: 95555
Petrolia
cityZIPs: 95558
Redcrest
cityZIPs: 95569
Redway
cityZIPs: 95560
Rio Dell
cityZIPs: 95562
Samoa
cityZIPs: 95564
Scotia
cityZIPs: 95565
Trinidad
cityZIPs: 95570
Whitethorn
cityZIPs: 95589
Willow Creek
cityZIPs: 95573
Active USPS ZIP Codes in Humboldt County
Standard delivery zones and geographic service boundaries
Frequently Asked Questions About Humboldt County, CA
What is the county seat and largest city in Humboldt County? ▾
The official county seat of Humboldt County is Eureka, and its largest incorporated municipality by population is Eureka.
How many cities, towns, and villages are in Humboldt County? ▾
Humboldt County encompasses 28 incorporated municipal entities, including 28 cities, 0 towns, and 0 villages.
What is the total population and land area of Humboldt County? ▾
According to official U.S. Census Bureau data, Humboldt County has a population of approximately 136,463 residents and spans an area of 3,568 square miles.
How many ZIP codes operate in Humboldt County? ▾
There are 29 active USPS ZIP codes serving addresses within Humboldt County, California.